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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On Tue, Aug 8, 2017 at 10:15 PM, John Schulz <jsch...@boundlessgeo.com> 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
> <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
>> <tbarsba...@boundlessgeo.com> wrote:
>> >
>> >
>> > On Thu, Jul 20, 2017 at 12:06 AM, Ian Turton <ijtur...@gmail.com> 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
>> >
>> >
>> >
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