Re: [Geotools-devel] Hue Rotate for Rasters

[Simone Giannecchini]

Ciao John,
that's ok, we might want to wrap this also as part of the contrast
stretch code in the future.
Let's see...

Regards,
Simone Giannecchini
==
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GeoSolutions S.A.S.
Via di Montramito 3/A
55054  Massarosa (LU)
Italy
phone: +39 0584 962313
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---
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On Tue, Aug 8, 2017 at 10:15 PM, John Schulz  wrote:
> Simone,
> I've gone with the approach to right now implement this as a rendering
> transformation.  I took this approach because it is less invasive than the
> other approaches and the operation can easily used as a raster process and
> SLD.  Let me know if you have any concerns.
>
> Thanks,
>
> John Schulz
>
> On Thu, Aug 3, 2017 at 8:18 AM, Simone Giannecchini
>  wrote:
>>
>> Chiming in late.
>>
>> My suggestions would be as follows:
>> - implement the operation in the ImageWorker. Most/All the logic
>> should stay here.
>> - Add a new contrast enhancement
>>
>> Adding a rendering transformation later on for whatever reason would
>> be very easy.
>>
>> That said, if you want to have full performance you might have to go
>> down to implement the operation directly in JAI/JAI-Ext rather than
>> combining various JAI operations; however, this is another story..
>>
>> Regards,
>> Simone Giannecchini
>> ==
>> GeoServer Professional Services from the experts!
>> Visit http://goo.gl/it488V for more information.
>> ==
>> Ing. Simone Giannecchini
>> @simogeo
>> Founder/Director
>>
>> GeoSolutions S.A.S.
>> Via di Montramito 3/A
>> 55054  Massarosa (LU)
>> Italy
>> phone: +39 0584 962313
>> fax: +39 0584 1660272
>> mob:   +39 333 8128928
>>
>> http://www.geo-solutions.it
>> http://twitter.com/geosolutions_it
>>
>> ---
>> AVVERTENZE AI SENSI DEL D.Lgs. 196/2003
>> Le informazioni contenute in questo messaggio di posta elettronica e/o
>> nel/i file/s allegato/i sono da considerarsi strettamente riservate.
>> Il loro utilizzo è consentito esclusivamente al destinatario del
>> messaggio, per le finalità indicate nel messaggio stesso. Qualora
>> riceviate questo messaggio senza esserne il destinatario, Vi preghiamo
>> cortesemente di darcene notizia via e-mail e di procedere alla
>> distruzione del messaggio stesso, cancellandolo dal Vostro sistema.
>> Conservare il messaggio stesso, divulgarlo anche in parte,
>> distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità
>> diverse, costituisce comportamento contrario ai principi dettati dal
>> D.Lgs. 196/2003.
>>
>> The information in this message and/or attachments, is intended solely
>> for the attention and use of the named addressee(s) and may be
>> confidential or proprietary in nature or covered by the provisions of
>> privacy act (Legislative Decree June, 30 2003, no.196 - Italy's New
>> Data Protection Code).Any use not in accord with its purpose, any
>> disclosure, reproduction, copying, distribution, or either
>> dissemination, either whole or partial, 

Re: [Geotools-devel] Hue Rotate for Rasters

[John Schulz]

Simone,
I've gone with the approach to right now implement this as a rendering
transformation.  I took this approach because it is less invasive than the
other approaches and the operation can easily used as a raster process and
SLD.  Let me know if you have any concerns.

Thanks,

John Schulz

On Thu, Aug 3, 2017 at 8:18 AM, Simone Giannecchini <
simone.giannecch...@geo-solutions.it> wrote:

> Chiming in late.
>
> My suggestions would be as follows:
> - implement the operation in the ImageWorker. Most/All the logic
> should stay here.
> - Add a new contrast enhancement
>
> Adding a rendering transformation later on for whatever reason would
> be very easy.
>
> That said, if you want to have full performance you might have to go
> down to implement the operation directly in JAI/JAI-Ext rather than
> combining various JAI operations; however, this is another story..
>
> Regards,
> Simone Giannecchini
> ==
> GeoServer Professional Services from the experts!
> Visit http://goo.gl/it488V for more information.
> ==
> Ing. Simone Giannecchini
> @simogeo
> Founder/Director
>
> GeoSolutions S.A.S.
> Via di Montramito 3/A
> 55054  Massarosa (LU)
> Italy
> phone: +39 0584 962313
> fax: +39 0584 1660272
> mob:   +39 333 8128928
>
> http://www.geo-solutions.it
> http://twitter.com/geosolutions_it
>
> ---
> AVVERTENZE AI SENSI DEL D.Lgs. 196/2003
> Le informazioni contenute in questo messaggio di posta elettronica e/o
> nel/i file/s allegato/i sono da considerarsi strettamente riservate.
> Il loro utilizzo è consentito esclusivamente al destinatario del
> messaggio, per le finalità indicate nel messaggio stesso. Qualora
> riceviate questo messaggio senza esserne il destinatario, Vi preghiamo
> cortesemente di darcene notizia via e-mail e di procedere alla
> distruzione del messaggio stesso, cancellandolo dal Vostro sistema.
> Conservare il messaggio stesso, divulgarlo anche in parte,
> distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità
> diverse, costituisce comportamento contrario ai principi dettati dal
> D.Lgs. 196/2003.
>
> The information in this message and/or attachments, is intended solely
> for the attention and use of the named addressee(s) and may be
> confidential or proprietary in nature or covered by the provisions of
> privacy act (Legislative Decree June, 30 2003, no.196 - Italy's New
> Data Protection Code).Any use not in accord with its purpose, any
> disclosure, reproduction, copying, distribution, or either
> dissemination, either whole or partial, is strictly forbidden except
> previous formal approval of the named addressee(s). If you are not the
> intended recipient, please contact immediately the sender by
> telephone, fax or e-mail and delete the information in this message
> that has been received in error. The sender does not give any warranty
> or accept liability as the content, accuracy or completeness of sent
> messages and accepts no responsibility  for changes made after they
> were sent or for other risks which arise as a result of e-mail
> transmission, viruses, etc.
>
>
> On Thu, Jul 20, 2017 at 7:10 PM, Torben Barsballe
>  wrote:
> >
> >
> > On Thu, Jul 20, 2017 at 12:06 AM, Ian Turton  wrote:
> >>
> >> I think that how you expose this to the user depends on what you or they
> >> think the process is going to be used for.
> >>
> >> I lean towards the rendering transformation as I see it as a process to
> >> transform a raster into another one rather than an enhancement of the
> >> raster. But I'm not a raster expert and I've never come across this
> type of
> >> transformation before.
> >>
> >
> > To provide a bit of an alternate viewpoint, in the places I have seen
> > hue-rotate used it has been the same type of operation as
> > brightness/contrast or changing the saturation. This has generally not
> been
> > in a GeoSpatial context however, just general image transformations.
> >
> > Given that we are using a ContrastEnhancement for brightness / contrast,
> I
> > could completely understand using a similar Color Enhancement for hue
> > rotate.
> >
> > That said, I'm sure a rendering transform would be fine too.
> >
> > Torben
> >
> >
> > 
> --
> > Check out the vibrant tech community on one of the world's most
> > engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> > ___
> > GeoTools-Devel mailing list
> > GeoTools-Devel@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/geotools-devel
> >
>
> 
> --
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> ___
> GeoTools-Devel mailing list
> 

Re: [Geotools-devel] Hue Rotate for Rasters

[Simone Giannecchini]

Chiming in late.

My suggestions would be as follows:
- implement the operation in the ImageWorker. Most/All the logic
should stay here.
- Add a new contrast enhancement

Adding a rendering transformation later on for whatever reason would
be very easy.

That said, if you want to have full performance you might have to go
down to implement the operation directly in JAI/JAI-Ext rather than
combining various JAI operations; however, this is another story..

Regards,
Simone Giannecchini
==
GeoServer Professional Services from the experts!
Visit http://goo.gl/it488V for more information.
==
Ing. Simone Giannecchini
@simogeo
Founder/Director

GeoSolutions S.A.S.
Via di Montramito 3/A
55054  Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob:   +39  333 8128928

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

---
AVVERTENZE AI SENSI DEL D.Lgs. 196/2003
Le informazioni contenute in questo messaggio di posta elettronica e/o
nel/i file/s allegato/i sono da considerarsi strettamente riservate.
Il loro utilizzo è consentito esclusivamente al destinatario del
messaggio, per le finalità indicate nel messaggio stesso. Qualora
riceviate questo messaggio senza esserne il destinatario, Vi preghiamo
cortesemente di darcene notizia via e-mail e di procedere alla
distruzione del messaggio stesso, cancellandolo dal Vostro sistema.
Conservare il messaggio stesso, divulgarlo anche in parte,
distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità
diverse, costituisce comportamento contrario ai principi dettati dal
D.Lgs. 196/2003.

The information in this message and/or attachments, is intended solely
for the attention and use of the named addressee(s) and may be
confidential or proprietary in nature or covered by the provisions of
privacy act (Legislative Decree June, 30 2003, no.196 - Italy's New
Data Protection Code).Any use not in accord with its purpose, any
disclosure, reproduction, copying, distribution, or either
dissemination, either whole or partial, is strictly forbidden except
previous formal approval of the named addressee(s). If you are not the
intended recipient, please contact immediately the sender by
telephone, fax or e-mail and delete the information in this message
that has been received in error. The sender does not give any warranty
or accept liability as the content, accuracy or completeness of sent
messages and accepts no responsibility  for changes made after they
were sent or for other risks which arise as a result of e-mail
transmission, viruses, etc.


On Thu, Jul 20, 2017 at 7:10 PM, Torben Barsballe
 wrote:
>
>
> On Thu, Jul 20, 2017 at 12:06 AM, Ian Turton  wrote:
>>
>> I think that how you expose this to the user depends on what you or they
>> think the process is going to be used for.
>>
>> I lean towards the rendering transformation as I see it as a process to
>> transform a raster into another one rather than an enhancement of the
>> raster. But I'm not a raster expert and I've never come across this type of
>> transformation before.
>>
>
> To provide a bit of an alternate viewpoint, in the places I have seen
> hue-rotate used it has been the same type of operation as
> brightness/contrast or changing the saturation. This has generally not been
> in a GeoSpatial context however, just general image transformations.
>
> Given that we are using a ContrastEnhancement for brightness / contrast, I
> could completely understand using a similar Color Enhancement for hue
> rotate.
>
> That said, I'm sure a rendering transform would be fine too.
>
> Torben
>
>
> --
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> ___
> GeoTools-Devel mailing list
> GeoTools-Devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/geotools-devel
>

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Re: [Geotools-devel] Hue Rotate for Rasters

[Torben Barsballe]

On Thu, Jul 20, 2017 at 12:06 AM, Ian Turton  wrote:

> I think that how you expose this to the user depends on what you or they
> think the process is going to be used for.
>
> I lean towards the rendering transformation as I see it as a process to
> transform a raster into another one rather than an enhancement of the
> raster. But I'm not a raster expert and I've never come across this type of
> transformation before.
>
>
To provide a bit of an alternate viewpoint, in the places I have seen
hue-rotate used it has been the same type of operation as
brightness/contrast or changing the saturation. This has generally not been
in a GeoSpatial context however, just general image transformations.

Given that we are using a ContrastEnhancement for brightness / contrast, I
could completely understand using a similar Color Enhancement for hue
rotate.

That said, I'm sure a rendering transform would be fine too.

Torben
--
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot___
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https://lists.sourceforge.net/lists/listinfo/geotools-devel

Re: [Geotools-devel] Hue Rotate for Rasters

[Ian Turton]

I think that how you expose this to the user depends on what you or they
think the process is going to be used for.

I lean towards the rendering transformation as I see it as a process to
transform a raster into another one rather than an enhancement of the
raster. But I'm not a raster expert and I've never come across this type of
transformation before.

Ian

On 19 Jul 2017 18:00, "John Schulz"  wrote:

To all,

I am wanting to move forward with creating a proposal for an implementation
to extend functionality for HueRotate and Saturation for rasters.  As
stated by Torben the basic idea would be to take an image and convert it to
the HSV or HSL  color space and
rotate the hue of each pixel by the same degree across the entire image,
keeping the relative appearance in tact.  A good example can be found here:

http://crawlingrobotfortress.blogspot.ca/2013/06/optimizing-hue-rotation-
operator.html

In this discussion I believe there are two feasible approaches and was
looking for any additional input in deciding the best way to move forward
with the proposal.

1.  Create a new rendering transformation

option.  This approach would be considered a raster-to-raster
transformation and would require creating and executing a new process and
operation/function and extending its use to the  SLD.

2.  Create a new normalization process for colors similar to the Contrast
Enhancement

normalization, extending the RasterSymbolizer elements.  I feel that this
option could be implemented in a couple of different ways as well.
a. Extend the algorithm vendor option to include HueRotate and
Saturation algorithms for Normalize within Contrast Enhancement.
b. Create a new SLD element "ColorEnhancement" to follow in a similar
fashion as Contrast Enhancement and the Normalize, but specifically
altering the colorspace.

Any additional thoughts would be appreciated,

Thanks,

John

On Fri, Jul 14, 2017 at 5:49 PM, Torben Barsballe <
tbarsba...@boundlessgeo.com> wrote:

> Hi Ian,
>
> Here are a couple of references that deal with implementing Hue-Rotate:
>
> https://beesbuzz.biz/code/hsv_color_transforms.php
> http://crawlingrobotfortress.blogspot.ca/2013/06/optimizing-
> hue-rotation-operator.html
>
> The basic idea is you have an image in the HSV
>  colour space, and you change
> the increment the Hue of each pixel by some amount. This has the effect of
> "rotating" the hue of the image as a whole.
>
> It is a fairly common transform in most graphical programs (like GIMP or
> Photoshop).
>
> Torben
>
> On Fri, Jul 14, 2017 at 1:59 PM, Jody Garnett 
> wrote:
>
>> Thanks for the correction Andrea, this would be a raster-to-raster
>> rendering transform, or a new normalization algorithm.
>>
>> Ian - Hue rotate is used when an image has been produced with
>> complementary colours (in a colour wheel sense). If you can image spinning
>> the color wheel while leaving the everything in the same relative position.
>> It is used in video games for example to reuse graphic assets. Torben had a
>> good reference if we ask him.
>>
>>
>>
>>
>> --
>> Jody Garnett
>>
>> On 14 July 2017 at 13:18, Andrea Aime 
>> wrote:
>>
>>> Ian,
>>> Jody is calling them geometry transformations, but he really means
>>> rendering transformations (geometry transformation
>>> is the act of applying a function inside the geometry tag for the
>>> current vector feature, has nothing to do with rasters):
>>>
>>> http://docs.geoserver.org/stable/en/user/styling/sld/extensi
>>> ons/geometry-transformations.html
>>> http://docs.geoserver.org/stable/en/user/styling/sld/extensi
>>> ons/rendering-transform.html
>>>
>>> Cheers
>>> Andrea
>>>
>>> On Fri, Jul 14, 2017 at 9:25 PM, Ian Turton  wrote:
>>>
 Could you please expand on what hue rotate does? I'm not sure if I
 understand it well enough to decide if it is an image operation or a
 geometry operation.

 Ian

 On 14 Jul 2017 18:15, "Jody Garnett"  wrote:

 ShadedRelief was the only other thing I could think of, in SLD spec
 directly.

 We also have our geoserver specific extension for geometry
 transformations. We have to ask someone here if that can be used to
 introduce the colorSpace operation
  to
 HSV and then a bandcombine operation
  for
 the color rotation in an efficient manner for rendering.

 --
 Jody Garnett

 On 14 July 2017 at 09:04, John Schulz  wrote:

Re: [Geotools-devel] Hue Rotate for Rasters

[John Schulz]

To all,

I am wanting to move forward with creating a proposal for an implementation
to extend functionality for HueRotate and Saturation for rasters.  As
stated by Torben the basic idea would be to take an image and convert it to
the HSV or HSL  color space and
rotate the hue of each pixel by the same degree across the entire image,
keeping the relative appearance in tact.  A good example can be found here:

http://crawlingrobotfortress.blogspot.ca/2013/06/optimizing-hue-rotation-operator.html

In this discussion I believe there are two feasible approaches and was
looking for any additional input in deciding the best way to move forward
with the proposal.

1.  Create a new rendering transformation

option.  This approach would be considered a raster-to-raster
transformation and would require creating and executing a new process and
operation/function and extending its use to the  SLD.

2.  Create a new normalization process for colors similar to the Contrast
Enhancement

normalization, extending the RasterSymbolizer elements.  I feel that this
option could be implemented in a couple of different ways as well.
a. Extend the algorithm vendor option to include HueRotate and
Saturation algorithms for Normalize within Contrast Enhancement.
b. Create a new SLD element "ColorEnhancement" to follow in a similar
fashion as Contrast Enhancement and the Normalize, but specifically
altering the colorspace.

Any additional thoughts would be appreciated,

Thanks,

John

On Fri, Jul 14, 2017 at 5:49 PM, Torben Barsballe <
tbarsba...@boundlessgeo.com> wrote:

> Hi Ian,
>
> Here are a couple of references that deal with implementing Hue-Rotate:
>
> https://beesbuzz.biz/code/hsv_color_transforms.php
> http://crawlingrobotfortress.blogspot.ca/2013/06/optimizing-hue-rotation-
> operator.html
>
> The basic idea is you have an image in the HSV
>  colour space, and you change
> the increment the Hue of each pixel by some amount. This has the effect of
> "rotating" the hue of the image as a whole.
>
> It is a fairly common transform in most graphical programs (like GIMP or
> Photoshop).
>
> Torben
>
> On Fri, Jul 14, 2017 at 1:59 PM, Jody Garnett 
> wrote:
>
>> Thanks for the correction Andrea, this would be a raster-to-raster
>> rendering transform, or a new normalization algorithm.
>>
>> Ian - Hue rotate is used when an image has been produced with
>> complementary colours (in a colour wheel sense). If you can image spinning
>> the color wheel while leaving the everything in the same relative position.
>> It is used in video games for example to reuse graphic assets. Torben had a
>> good reference if we ask him.
>>
>>
>>
>>
>> --
>> Jody Garnett
>>
>> On 14 July 2017 at 13:18, Andrea Aime 
>> wrote:
>>
>>> Ian,
>>> Jody is calling them geometry transformations, but he really means
>>> rendering transformations (geometry transformation
>>> is the act of applying a function inside the geometry tag for the
>>> current vector feature, has nothing to do with rasters):
>>>
>>> http://docs.geoserver.org/stable/en/user/styling/sld/extensi
>>> ons/geometry-transformations.html
>>> http://docs.geoserver.org/stable/en/user/styling/sld/extensi
>>> ons/rendering-transform.html
>>>
>>> Cheers
>>> Andrea
>>>
>>> On Fri, Jul 14, 2017 at 9:25 PM, Ian Turton  wrote:
>>>
 Could you please expand on what hue rotate does? I'm not sure if I
 understand it well enough to decide if it is an image operation or a
 geometry operation.

 Ian

 On 14 Jul 2017 18:15, "Jody Garnett"  wrote:

 ShadedRelief was the only other thing I could think of, in SLD spec
 directly.

 We also have our geoserver specific extension for geometry
 transformations. We have to ask someone here if that can be used to
 introduce the colorSpace operation
  to
 HSV and then a bandcombine operation
  for
 the color rotation in an efficient manner for rendering.

 --
 Jody Garnett

 On 14 July 2017 at 09:04, John Schulz  wrote:

> I looking through what additional functionality I am looking for,  I
> think it might be appropriate to add in a ColorEnhancement element of
> sorts, to include algorithms for HueRotate and Saturation.  I seems like a
> lot of my work would overlap with what is already in ContrastEnhancement
> and not sure how the additional efforts would payout.
>
> @Jody - you did mention that it might be better to 

Re: [Geotools-devel] Hue Rotate for Rasters

[Torben Barsballe]

Hi Ian,

Here are a couple of references that deal with implementing Hue-Rotate:

https://beesbuzz.biz/code/hsv_color_transforms.php
http://crawlingrobotfortress.blogspot.ca/2013/06/optimizing-hue-rotation-operator.html

The basic idea is you have an image in the HSV
 colour space, and you change
the increment the Hue of each pixel by some amount. This has the effect of
"rotating" the hue of the image as a whole.

It is a fairly common transform in most graphical programs (like GIMP or
Photoshop).

Torben

On Fri, Jul 14, 2017 at 1:59 PM, Jody Garnett 
wrote:

> Thanks for the correction Andrea, this would be a raster-to-raster
> rendering transform, or a new normalization algorithm.
>
> Ian - Hue rotate is used when an image has been produced with
> complementary colours (in a colour wheel sense). If you can image spinning
> the color wheel while leaving the everything in the same relative position.
> It is used in video games for example to reuse graphic assets. Torben had a
> good reference if we ask him.
>
>
>
>
> --
> Jody Garnett
>
> On 14 July 2017 at 13:18, Andrea Aime 
> wrote:
>
>> Ian,
>> Jody is calling them geometry transformations, but he really means
>> rendering transformations (geometry transformation
>> is the act of applying a function inside the geometry tag for the current
>> vector feature, has nothing to do with rasters):
>>
>> http://docs.geoserver.org/stable/en/user/styling/sld/extensi
>> ons/geometry-transformations.html
>> http://docs.geoserver.org/stable/en/user/styling/sld/extensi
>> ons/rendering-transform.html
>>
>> Cheers
>> Andrea
>>
>> On Fri, Jul 14, 2017 at 9:25 PM, Ian Turton  wrote:
>>
>>> Could you please expand on what hue rotate does? I'm not sure if I
>>> understand it well enough to decide if it is an image operation or a
>>> geometry operation.
>>>
>>> Ian
>>>
>>> On 14 Jul 2017 18:15, "Jody Garnett"  wrote:
>>>
>>> ShadedRelief was the only other thing I could think of, in SLD spec
>>> directly.
>>>
>>> We also have our geoserver specific extension for geometry
>>> transformations. We have to ask someone here if that can be used to
>>> introduce the colorSpace operation
>>>  to HSV
>>> and then a bandcombine operation
>>>  for
>>> the color rotation in an efficient manner for rendering.
>>>
>>> --
>>> Jody Garnett
>>>
>>> On 14 July 2017 at 09:04, John Schulz  wrote:
>>>
 I looking through what additional functionality I am looking for,  I
 think it might be appropriate to add in a ColorEnhancement element of
 sorts, to include algorithms for HueRotate and Saturation.  I seems like a
 lot of my work would overlap with what is already in ContrastEnhancement
 and not sure how the additional efforts would payout.

 @Jody - you did mention that it might be better to implement in a
 similar fashion of ShadedRelief, which would entail a new element in the
 RasterLayer anyway - thoughts?

 John Schulz

 On Fri, Jul 14, 2017 at 9:17 AM, Jody Garnett 
 wrote:

> Ian with respect to exposing new methods to the SLD, do you think Hue
> Rotate could be added as a new Color Normalization algorithm?
>
> The only other example I could think of would be as a geometry
> transformation, both options kind of make sense so I was not sure what to
> recommend.
>
> --
> Jody Garnett
>
> On 14 July 2017 at 00:47, Ian Turton  wrote:
>
>> Hi John,
>>
>> I'm not sure I'm necessarily the right person to ask about this as
>> all I did was expose the new methods to the SLD so that people could make
>> use of the new functionality. The actual code to make changes to the 
>> raster
>> was writen long before I was there - https://github.com/geotools/
>> geotools/blame/master/modules/library/render/src/main/java/o
>> rg/geotools/renderer/lite/gridcoverage2d/ContrastEnhancementNode.java
>>
>> Hope that helps, if not feel free to continue to ask questions on
>> this list. Though I warn you a lot of us are travelling this week for
>> FOSS4GE and then building up to FOSS4G so there may be delays in 
>> responding.
>>
>> Ian
>>
>> On 12 July 2017 at 19:29, John Schulz 
>> wrote:
>>
>>> Greeting Ian,
>>>
>>> I'm working on creating a hue rotate option for rasters processed in
>>> Geotools and with speaking with my team have come across your work with
>>> ContrastEnhancement and was hoping to get some insight into working with
>>> the normalization process and how it might be used in my endeavors.
>>>
>>> I look forward to 

Re: [Geotools-devel] Hue Rotate for Rasters

[Jody Garnett]

Thanks for the correction Andrea, this would be a raster-to-raster
rendering transform, or a new normalization algorithm.

Ian - Hue rotate is used when an image has been produced with complementary
colours (in a colour wheel sense). If you can image spinning the color
wheel while leaving the everything in the same relative position. It is
used in video games for example to reuse graphic assets. Torben had a good
reference if we ask him.




--
Jody Garnett

On 14 July 2017 at 13:18, Andrea Aime  wrote:

> Ian,
> Jody is calling them geometry transformations, but he really means
> rendering transformations (geometry transformation
> is the act of applying a function inside the geometry tag for the current
> vector feature, has nothing to do with rasters):
>
> http://docs.geoserver.org/stable/en/user/styling/sld/extensions/geometry-
> transformations.html
> http://docs.geoserver.org/stable/en/user/styling/sld/extensions/rendering-
> transform.html
>
> Cheers
> Andrea
>
> On Fri, Jul 14, 2017 at 9:25 PM, Ian Turton  wrote:
>
>> Could you please expand on what hue rotate does? I'm not sure if I
>> understand it well enough to decide if it is an image operation or a
>> geometry operation.
>>
>> Ian
>>
>> On 14 Jul 2017 18:15, "Jody Garnett"  wrote:
>>
>> ShadedRelief was the only other thing I could think of, in SLD spec
>> directly.
>>
>> We also have our geoserver specific extension for geometry
>> transformations. We have to ask someone here if that can be used to
>> introduce the colorSpace operation
>>  to HSV
>> and then a bandcombine operation
>>  for the
>> color rotation in an efficient manner for rendering.
>>
>> --
>> Jody Garnett
>>
>> On 14 July 2017 at 09:04, John Schulz  wrote:
>>
>>> I looking through what additional functionality I am looking for,  I
>>> think it might be appropriate to add in a ColorEnhancement element of
>>> sorts, to include algorithms for HueRotate and Saturation.  I seems like a
>>> lot of my work would overlap with what is already in ContrastEnhancement
>>> and not sure how the additional efforts would payout.
>>>
>>> @Jody - you did mention that it might be better to implement in a
>>> similar fashion of ShadedRelief, which would entail a new element in the
>>> RasterLayer anyway - thoughts?
>>>
>>> John Schulz
>>>
>>> On Fri, Jul 14, 2017 at 9:17 AM, Jody Garnett 
>>> wrote:
>>>
 Ian with respect to exposing new methods to the SLD, do you think Hue
 Rotate could be added as a new Color Normalization algorithm?

 The only other example I could think of would be as a geometry
 transformation, both options kind of make sense so I was not sure what to
 recommend.

 --
 Jody Garnett

 On 14 July 2017 at 00:47, Ian Turton  wrote:

> Hi John,
>
> I'm not sure I'm necessarily the right person to ask about this as all
> I did was expose the new methods to the SLD so that people could make use
> of the new functionality. The actual code to make changes to the raster 
> was
> writen long before I was there - https://github.com/geotools/
> geotools/blame/master/modules/library/render/src/main/java/o
> rg/geotools/renderer/lite/gridcoverage2d/ContrastEnhancementNode.java
>
> Hope that helps, if not feel free to continue to ask questions on this
> list. Though I warn you a lot of us are travelling this week for FOSS4GE
> and then building up to FOSS4G so there may be delays in responding.
>
> Ian
>
> On 12 July 2017 at 19:29, John Schulz 
> wrote:
>
>> Greeting Ian,
>>
>> I'm working on creating a hue rotate option for rasters processed in
>> Geotools and with speaking with my team have come across your work with
>> ContrastEnhancement and was hoping to get some insight into working with
>> the normalization process and how it might be used in my endeavors.
>>
>> I look forward to hearing back on your thoughts.
>>
>> Cheers,
>>
>> John
>>
>
>
>
> --
> Ian Turton
>
> 
> --
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> ___
> GeoTools-Devel mailing list
> GeoTools-Devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/geotools-devel
>
>

>>>
>>
>>
>> 
>> --
>> Check out the vibrant tech community on one of the world's most
>> engaging tech sites, 

Re: [Geotools-devel] Hue Rotate for Rasters

[Andrea Aime]

Ian,
Jody is calling them geometry transformations, but he really means
rendering transformations (geometry transformation
is the act of applying a function inside the geometry tag for the current
vector feature, has nothing to do with rasters):

http://docs.geoserver.org/stable/en/user/styling/sld/extensions/geometry-transformations.html
http://docs.geoserver.org/stable/en/user/styling/sld/extensions/rendering-transform.html

Cheers
Andrea

On Fri, Jul 14, 2017 at 9:25 PM, Ian Turton  wrote:

> Could you please expand on what hue rotate does? I'm not sure if I
> understand it well enough to decide if it is an image operation or a
> geometry operation.
>
> Ian
>
> On 14 Jul 2017 18:15, "Jody Garnett"  wrote:
>
> ShadedRelief was the only other thing I could think of, in SLD spec
> directly.
>
> We also have our geoserver specific extension for geometry
> transformations. We have to ask someone here if that can be used to
> introduce the colorSpace operation
>  to HSV
> and then a bandcombine operation
>  for the
> color rotation in an efficient manner for rendering.
>
> --
> Jody Garnett
>
> On 14 July 2017 at 09:04, John Schulz  wrote:
>
>> I looking through what additional functionality I am looking for,  I
>> think it might be appropriate to add in a ColorEnhancement element of
>> sorts, to include algorithms for HueRotate and Saturation.  I seems like a
>> lot of my work would overlap with what is already in ContrastEnhancement
>> and not sure how the additional efforts would payout.
>>
>> @Jody - you did mention that it might be better to implement in a similar
>> fashion of ShadedRelief, which would entail a new element in the
>> RasterLayer anyway - thoughts?
>>
>> John Schulz
>>
>> On Fri, Jul 14, 2017 at 9:17 AM, Jody Garnett 
>> wrote:
>>
>>> Ian with respect to exposing new methods to the SLD, do you think Hue
>>> Rotate could be added as a new Color Normalization algorithm?
>>>
>>> The only other example I could think of would be as a geometry
>>> transformation, both options kind of make sense so I was not sure what to
>>> recommend.
>>>
>>> --
>>> Jody Garnett
>>>
>>> On 14 July 2017 at 00:47, Ian Turton  wrote:
>>>
 Hi John,

 I'm not sure I'm necessarily the right person to ask about this as all
 I did was expose the new methods to the SLD so that people could make use
 of the new functionality. The actual code to make changes to the raster was
 writen long before I was there - https://github.com/geotools/
 geotools/blame/master/modules/library/render/src/main/java/o
 rg/geotools/renderer/lite/gridcoverage2d/ContrastEnhancementNode.java

 Hope that helps, if not feel free to continue to ask questions on this
 list. Though I warn you a lot of us are travelling this week for FOSS4GE
 and then building up to FOSS4G so there may be delays in responding.

 Ian

 On 12 July 2017 at 19:29, John Schulz  wrote:

> Greeting Ian,
>
> I'm working on creating a hue rotate option for rasters processed in
> Geotools and with speaking with my team have come across your work with
> ContrastEnhancement and was hoping to get some insight into working with
> the normalization process and how it might be used in my endeavors.
>
> I look forward to hearing back on your thoughts.
>
> Cheers,
>
> John
>



 --
 Ian Turton

 
 --
 Check out the vibrant tech community on one of the world's most
 engaging tech sites, Slashdot.org! http://sdm.link/slashdot
 ___
 GeoTools-Devel mailing list
 GeoTools-Devel@lists.sourceforge.net
 https://lists.sourceforge.net/lists/listinfo/geotools-devel


>>>
>>
>
>
> 
> --
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> ___
> GeoTools-Devel mailing list
> GeoTools-Devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/geotools-devel
>
>


-- 

Regards,

Andrea Aime

==
GeoServer Professional Services from the experts! Visit http://goo.gl/it488V
for more information.
==

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
Via di Montramito 3/A
55054  Massarosa (LU)
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39  339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

AVVERTENZE AI SENSI DEL D.Lgs. 196/2003

Le informazioni contenute in questo messaggio di posta 

Re: [Geotools-devel] Hue Rotate for Rasters

[Ian Turton]

Could you please expand on what hue rotate does? I'm not sure if I
understand it well enough to decide if it is an image operation or a
geometry operation.

Ian

On 14 Jul 2017 18:15, "Jody Garnett"  wrote:

ShadedRelief was the only other thing I could think of, in SLD spec
directly.

We also have our geoserver specific extension for geometry transformations.
We have to ask someone here if that can be used to introduce the colorSpace
operation 
to HSV and then a bandcombine operation
 for the
color rotation in an efficient manner for rendering.

--
Jody Garnett

On 14 July 2017 at 09:04, John Schulz  wrote:

> I looking through what additional functionality I am looking for,  I think
> it might be appropriate to add in a ColorEnhancement element of sorts, to
> include algorithms for HueRotate and Saturation.  I seems like a lot of my
> work would overlap with what is already in ContrastEnhancement and not sure
> how the additional efforts would payout.
>
> @Jody - you did mention that it might be better to implement in a similar
> fashion of ShadedRelief, which would entail a new element in the
> RasterLayer anyway - thoughts?
>
> John Schulz
>
> On Fri, Jul 14, 2017 at 9:17 AM, Jody Garnett 
> wrote:
>
>> Ian with respect to exposing new methods to the SLD, do you think Hue
>> Rotate could be added as a new Color Normalization algorithm?
>>
>> The only other example I could think of would be as a geometry
>> transformation, both options kind of make sense so I was not sure what to
>> recommend.
>>
>> --
>> Jody Garnett
>>
>> On 14 July 2017 at 00:47, Ian Turton  wrote:
>>
>>> Hi John,
>>>
>>> I'm not sure I'm necessarily the right person to ask about this as all I
>>> did was expose the new methods to the SLD so that people could make use of
>>> the new functionality. The actual code to make changes to the raster was
>>> writen long before I was there - https://github.com/geotools/
>>> geotools/blame/master/modules/library/render/src/main/java/o
>>> rg/geotools/renderer/lite/gridcoverage2d/ContrastEnhancementNode.java
>>>
>>> Hope that helps, if not feel free to continue to ask questions on this
>>> list. Though I warn you a lot of us are travelling this week for FOSS4GE
>>> and then building up to FOSS4G so there may be delays in responding.
>>>
>>> Ian
>>>
>>> On 12 July 2017 at 19:29, John Schulz  wrote:
>>>
 Greeting Ian,

 I'm working on creating a hue rotate option for rasters processed in
 Geotools and with speaking with my team have come across your work with
 ContrastEnhancement and was hoping to get some insight into working with
 the normalization process and how it might be used in my endeavors.

 I look forward to hearing back on your thoughts.

 Cheers,

 John

>>>
>>>
>>>
>>> --
>>> Ian Turton
>>>
>>> 
>>> --
>>> Check out the vibrant tech community on one of the world's most
>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>>> ___
>>> GeoTools-Devel mailing list
>>> GeoTools-Devel@lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/geotools-devel
>>>
>>>
>>
>
--
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot___
GeoTools-Devel mailing list
GeoTools-Devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geotools-devel

Re: [Geotools-devel] Hue Rotate for Rasters

[Jody Garnett]

ShadedRelief was the only other thing I could think of, in SLD spec
directly.

We also have our geoserver specific extension for geometry transformations.
We have to ask someone here if that can be used to introduce the colorSpace
operation 
to HSV and then a bandcombine operation
 for the
color rotation in an efficient manner for rendering.

--
Jody Garnett

On 14 July 2017 at 09:04, John Schulz  wrote:

> I looking through what additional functionality I am looking for,  I think
> it might be appropriate to add in a ColorEnhancement element of sorts, to
> include algorithms for HueRotate and Saturation.  I seems like a lot of my
> work would overlap with what is already in ContrastEnhancement and not sure
> how the additional efforts would payout.
>
> @Jody - you did mention that it might be better to implement in a similar
> fashion of ShadedRelief, which would entail a new element in the
> RasterLayer anyway - thoughts?
>
> John Schulz
>
> On Fri, Jul 14, 2017 at 9:17 AM, Jody Garnett 
> wrote:
>
>> Ian with respect to exposing new methods to the SLD, do you think Hue
>> Rotate could be added as a new Color Normalization algorithm?
>>
>> The only other example I could think of would be as a geometry
>> transformation, both options kind of make sense so I was not sure what to
>> recommend.
>>
>> --
>> Jody Garnett
>>
>> On 14 July 2017 at 00:47, Ian Turton  wrote:
>>
>>> Hi John,
>>>
>>> I'm not sure I'm necessarily the right person to ask about this as all I
>>> did was expose the new methods to the SLD so that people could make use of
>>> the new functionality. The actual code to make changes to the raster was
>>> writen long before I was there - https://github.com/geotools/
>>> geotools/blame/master/modules/library/render/src/main/java/o
>>> rg/geotools/renderer/lite/gridcoverage2d/ContrastEnhancementNode.java
>>>
>>> Hope that helps, if not feel free to continue to ask questions on this
>>> list. Though I warn you a lot of us are travelling this week for FOSS4GE
>>> and then building up to FOSS4G so there may be delays in responding.
>>>
>>> Ian
>>>
>>> On 12 July 2017 at 19:29, John Schulz  wrote:
>>>
 Greeting Ian,

 I'm working on creating a hue rotate option for rasters processed in
 Geotools and with speaking with my team have come across your work with
 ContrastEnhancement and was hoping to get some insight into working with
 the normalization process and how it might be used in my endeavors.

 I look forward to hearing back on your thoughts.

 Cheers,

 John

>>>
>>>
>>>
>>> --
>>> Ian Turton
>>>
>>> 
>>> --
>>> Check out the vibrant tech community on one of the world's most
>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>>> ___
>>> GeoTools-Devel mailing list
>>> GeoTools-Devel@lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/geotools-devel
>>>
>>>
>>
>
--
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot___
GeoTools-Devel mailing list
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https://lists.sourceforge.net/lists/listinfo/geotools-devel

Re: [Geotools-devel] Hue Rotate for Rasters

[John Schulz]

I meant to say:

"which would entail a new element in the *RasterSymbolizer*"

On Fri, Jul 14, 2017 at 11:04 AM, John Schulz 
wrote:

> I looking through what additional functionality I am looking for,  I think
> it might be appropriate to add in a ColorEnhancement element of sorts, to
> include algorithms for HueRotate and Saturation.  I seems like a lot of my
> work would overlap with what is already in ContrastEnhancement and not sure
> how the additional efforts would payout.
>
> @Jody - you did mention that it might be better to implement in a similar
> fashion of ShadedRelief, which would entail a new element in the
> RasterLayer anyway - thoughts?
>
> John Schulz
>
> On Fri, Jul 14, 2017 at 9:17 AM, Jody Garnett 
> wrote:
>
>> Ian with respect to exposing new methods to the SLD, do you think Hue
>> Rotate could be added as a new Color Normalization algorithm?
>>
>> The only other example I could think of would be as a geometry
>> transformation, both options kind of make sense so I was not sure what to
>> recommend.
>>
>> --
>> Jody Garnett
>>
>> On 14 July 2017 at 00:47, Ian Turton  wrote:
>>
>>> Hi John,
>>>
>>> I'm not sure I'm necessarily the right person to ask about this as all I
>>> did was expose the new methods to the SLD so that people could make use of
>>> the new functionality. The actual code to make changes to the raster was
>>> writen long before I was there - https://github.com/geotools/
>>> geotools/blame/master/modules/library/render/src/main/java/o
>>> rg/geotools/renderer/lite/gridcoverage2d/ContrastEnhancementNode.java
>>>
>>> Hope that helps, if not feel free to continue to ask questions on this
>>> list. Though I warn you a lot of us are travelling this week for FOSS4GE
>>> and then building up to FOSS4G so there may be delays in responding.
>>>
>>> Ian
>>>
>>> On 12 July 2017 at 19:29, John Schulz  wrote:
>>>
 Greeting Ian,

 I'm working on creating a hue rotate option for rasters processed in
 Geotools and with speaking with my team have come across your work with
 ContrastEnhancement and was hoping to get some insight into working with
 the normalization process and how it might be used in my endeavors.

 I look forward to hearing back on your thoughts.

 Cheers,

 John

>>>
>>>
>>>
>>> --
>>> Ian Turton
>>>
>>> 
>>> --
>>> Check out the vibrant tech community on one of the world's most
>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>>> ___
>>> GeoTools-Devel mailing list
>>> GeoTools-Devel@lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/geotools-devel
>>>
>>>
>>
>
--
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot___
GeoTools-Devel mailing list
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Re: [Geotools-devel] Hue Rotate for Rasters

[John Schulz]

I looking through what additional functionality I am looking for,  I think
it might be appropriate to add in a ColorEnhancement element of sorts, to
include algorithms for HueRotate and Saturation.  I seems like a lot of my
work would overlap with what is already in ContrastEnhancement and not sure
how the additional efforts would payout.

@Jody - you did mention that it might be better to implement in a similar
fashion of ShadedRelief, which would entail a new element in the
RasterLayer anyway - thoughts?

John Schulz

On Fri, Jul 14, 2017 at 9:17 AM, Jody Garnett 
wrote:

> Ian with respect to exposing new methods to the SLD, do you think Hue
> Rotate could be added as a new Color Normalization algorithm?
>
> The only other example I could think of would be as a geometry
> transformation, both options kind of make sense so I was not sure what to
> recommend.
>
> --
> Jody Garnett
>
> On 14 July 2017 at 00:47, Ian Turton  wrote:
>
>> Hi John,
>>
>> I'm not sure I'm necessarily the right person to ask about this as all I
>> did was expose the new methods to the SLD so that people could make use of
>> the new functionality. The actual code to make changes to the raster was
>> writen long before I was there - https://github.com/geotools/
>> geotools/blame/master/modules/library/render/src/main/java/o
>> rg/geotools/renderer/lite/gridcoverage2d/ContrastEnhancementNode.java
>>
>> Hope that helps, if not feel free to continue to ask questions on this
>> list. Though I warn you a lot of us are travelling this week for FOSS4GE
>> and then building up to FOSS4G so there may be delays in responding.
>>
>> Ian
>>
>> On 12 July 2017 at 19:29, John Schulz  wrote:
>>
>>> Greeting Ian,
>>>
>>> I'm working on creating a hue rotate option for rasters processed in
>>> Geotools and with speaking with my team have come across your work with
>>> ContrastEnhancement and was hoping to get some insight into working with
>>> the normalization process and how it might be used in my endeavors.
>>>
>>> I look forward to hearing back on your thoughts.
>>>
>>> Cheers,
>>>
>>> John
>>>
>>
>>
>>
>> --
>> Ian Turton
>>
>> 
>> --
>> Check out the vibrant tech community on one of the world's most
>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>> ___
>> GeoTools-Devel mailing list
>> GeoTools-Devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/geotools-devel
>>
>>
>
--
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot___
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Re: [Geotools-devel] Hue Rotate for Rasters

[Jody Garnett]

Ian with respect to exposing new methods to the SLD, do you think Hue
Rotate could be added as a new Color Normalization algorithm?

The only other example I could think of would be as a geometry
transformation, both options kind of make sense so I was not sure what to
recommend.

--
Jody Garnett

On 14 July 2017 at 00:47, Ian Turton  wrote:

> Hi John,
>
> I'm not sure I'm necessarily the right person to ask about this as all I
> did was expose the new methods to the SLD so that people could make use of
> the new functionality. The actual code to make changes to the raster was
> writen long before I was there - https://github.com/geotools/
> geotools/blame/master/modules/library/render/src/main/java/
> org/geotools/renderer/lite/gridcoverage2d/ContrastEnhancementNode.java
>
> Hope that helps, if not feel free to continue to ask questions on this
> list. Though I warn you a lot of us are travelling this week for FOSS4GE
> and then building up to FOSS4G so there may be delays in responding.
>
> Ian
>
> On 12 July 2017 at 19:29, John Schulz  wrote:
>
>> Greeting Ian,
>>
>> I'm working on creating a hue rotate option for rasters processed in
>> Geotools and with speaking with my team have come across your work with
>> ContrastEnhancement and was hoping to get some insight into working with
>> the normalization process and how it might be used in my endeavors.
>>
>> I look forward to hearing back on your thoughts.
>>
>> Cheers,
>>
>> John
>>
>
>
>
> --
> Ian Turton
>
> 
> --
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> ___
> GeoTools-Devel mailing list
> GeoTools-Devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/geotools-devel
>
>
--
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Re: [Geotools-devel] Hue Rotate for Rasters

[Ian Turton]

Hi John,

I'm not sure I'm necessarily the right person to ask about this as all I
did was expose the new methods to the SLD so that people could make use of
the new functionality. The actual code to make changes to the raster was
writen long before I was there -
https://github.com/geotools/geotools/blame/master/modules/library/render/src/main/java/org/geotools/renderer/lite/gridcoverage2d/ContrastEnhancementNode.java

Hope that helps, if not feel free to continue to ask questions on this
list. Though I warn you a lot of us are travelling this week for FOSS4GE
and then building up to FOSS4G so there may be delays in responding.

Ian

On 12 July 2017 at 19:29, John Schulz  wrote:

> Greeting Ian,
>
> I'm working on creating a hue rotate option for rasters processed in
> Geotools and with speaking with my team have come across your work with
> ContrastEnhancement and was hoping to get some insight into working with
> the normalization process and how it might be used in my endeavors.
>
> I look forward to hearing back on your thoughts.
>
> Cheers,
>
> John
>



-- 
Ian Turton
--
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot___
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