[Gimp-user] Gimp channel mixer

[rich404]

>There appears to be some confusion about raw loaders for GIMP 2.9.6.
>In response to rich404's post I tried opening a Nikon raw file
>directly into GIMP. It fails saying there is no raw loader installed,
>it then suggests using darktable or rawtherapee.
>
>
>I looked at the PARTHA.com site and it does state that uFRAW is
>preinstalled on GIMP 2.9.6, this is not true in my case.
>
>Another piece of confusion is on the sourceforge website where it
>states that Ufraw is only available as a standalone program under
>windows 10, it says there is a GIMP plug-in included, but it does not
>work.

You have every right to be confused.

The situation is:

ufraw is old and not updated - last release 2015. Apart from that, due to code
changes (file-raw-placeholder) the plugin does not work with Gimp 2.9.6

An updated re-mix nufraw https://sourceforge.net/projects/nufraw/ is more recent
but AFAIK there is no compiled-for-windows plugin there. This code also needs
updating to work with Gimp 2.9.6

For Windows Gimp 2.9.6 from www.gimp.org it is a vanilla version with no'extras'

Partha's Windows Gimp 2.9.6 standard edition does include a working nufraw that
will import a RAW image into Gimp from Gimp's open dialogue.

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[Gimp-user] Gimp channel mixer

[Oxonian]

>Not at all,and I have great respect for Elle Stone.
>
>How do I know who-is-who 
>
>If you ever come come to gimpusers-dot-com you will see that forum
>members names are in blue, mailing list in grey.
>
>Personally I hate mailing lists, stopped using the occasional academic
>list 20 years ago. The inability of subscribers to edit their posts
>continually amazes. Top posting 'thanks' followed by a page of nested
>quoted is not unusual.
>
>When it comes to  etiquette, probably got a better sense than many. At
>one time a four line signature was considered bad form.
>
>Now to go and play at selecting pictures in the new CAPTCHA format
>that is a real PITA.



There appears to be some confusion about raw loaders for GIMP 2.9.6. In response
to rich404's post I tried opening a Nikon raw file directly into GIMP. It fails
saying there is no raw loader installed, it then suggests using darktable or
rawtherapee.


I looked at the PARTHA.com site and it does state that uFRAW is preinstalled on
GIMP 2.9.6, this is not true in my case.

Another piece of confusion is on the sourceforge website where it states that
Ufraw is only available as a standalone program under windows 10, it says there
is a GIMP plug-in included, but it does not work.




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Re: [Gimp-user] Gimp channel mixer

[Patrick Shanahan]

* rich404  [10-30-17 07:48]:
> >And PhotoFlow, and any other raw processor that chooses to provide a 
> >plug-in using the same sort of plug-in code that RawTherapee,
> >darktable,
> >and PhotoFlow provide.
> >
> >Best,
> >Elle
> 
> Indeed there is PhotoFlow.
> 
> I do not normally reply to non-gimpusers-dot-com subscribers but...

a rather elitist attitude, isn't it?

does a "gimpusers" subscribee have *better* standing or knowledge or
manners than "non-gimpusers-dot-com" scribers?  and how would you know
that someone using their own email addr was not a "subscriber" or maybe
even a contributor/developer or someone who wanted to be?

but I may not qualify to even merit a reply :(.
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Re: [Gimp-user] Gimp channel mixer

[Elle Stone]

On 10/30/2017 06:36 AM, rich404 wrote:

Otherwise the two applications that Gimp recognises by default and will use, are
Rawtherapee and Darktable.


And PhotoFlow, and any other raw processor that chooses to provide a 
plug-in using the same sort of plug-in code that RawTherapee, darktable, 
and PhotoFlow provide.


Best,
Elle
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[Gimp-user] Gimp channel mixer

[Oxonian]

>Where are the TIFF images stored? What platform are you working on?
>
>Can you right-click on a TIFF image in the computer’s directory window
>and select “Open with…”? That’s how I open most images with GIMP. The
>import functions are handled by GIMP, and I tend to use the defaults.
>Haven’t noticed a thumbnail layer yet, but in time… ? Shrugs.
>
>I use an iMac running OS X 10.12.6
>
>Rick
>
> * * ** *** *  * * 
>It’s better to wave at a stranger than to ignore a friend
> * * ** *** *  * *

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[Gimp-user] Gimp channel mixer

[Oxonian]

Good morning, The platform I'm working on is Windows 10, when I export TIFF
files from NX2, I simply put them in a folder on the hard drive under Pictures.
I then use Windows file manager to organise them.

I've tried right clicking and using the  "open with" option, but GIMP is not an
available option. I have some files saved in the folder in .xcf format, if I
right click on these, GIMP appears in the "open with" options.

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[Gimp-user] Gimp channel mixer

[programmer_ceds]

I've just tried converting a file from jpg to tiff with ViewNX V2.10.3.

When opening in GIMP I get an error message about a null byte in the date field
but it then opens the file as two layers with the top (active) layer being the
thumbnail exactly as you said. Looks like this is a bug in ViewNX2.

Exporting a file in GIMP with the thumbnail selected doesn't cause this problem.

At least you have a workaround.

>Good morning all,  The image I was working on was created by Nikon's
>ViewNX2 editor, the original image format was Nikon's raw image .NEF
>extension, I exported this as a TIFF and then imported it to GIMP.
>
>In ViewNX2 the images are stored with a preview thumbnail, so I think
>you have hit the nail on the head, I got myself confused at first
>because I didn't notice the thumbnail in the image  before  I used the
>channel mixer. The image is an infrared photo, it's mostly sky and the
>thumbnail didn't stand enough for me to notice it. It's also so tiny
>that it can't be seen in the image layer page 1. After swapping The
>red and blue channels (not green, another mistake) the colours changed
>enough for the thumbnail to be obvious. I wrongly assumed that the
>channel mixer had created the thumbnail, in fact it was there all the
>time.
>
>Now I understand the problem I think I'll be OK, for a while anyway.
>
>I bought Klaus Goelker's book "GIMP 2.8 for photographers" last week,
>I'm working my way through it and thought I was doing OK, but I got
>myself too confused to sort this one.
>
>Before installing GIMP I read a review which said that GIMP was a very
>good program, but the learning curve was steep. I  think they were
>right on both points.
>
>Thankyou for your assistance, I know what I'm going to be doing during
>the long winter nights.

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Re: [Gimp-user] Gimp channel mixer

[Rick Kline]

Where are the TIFF images stored? What platform are you working on?

Can you right-click on a TIFF image in the computer’s directory window and 
select “Open with…”? That’s how I open most images with GIMP. The import 
functions are handled by GIMP, and I tend to use the defaults. Haven’t noticed 
a thumbnail layer yet, but in time… ? Shrugs.

I use an iMac running OS X 10.12.6

Rick

 * * ** *** *  * * 
It’s better to wave at a stranger than to ignore a friend
 * * ** *** *  * * 

> On Oct 29, 2017, at 5:15 AM, Oxonian  wrote:
> 
> 
> Good morning all,  The image I was working on was created by Nikon's ViewNX2
> editor, the original image format was Nikon's raw image .NEF extension, I
> exported this as a TIFF and then imported it to GIMP.
> 
> In ViewNX2 the images are stored with a preview thumbnail, so I think you have
> hit the nail on the head, I got myself confused at first because I didn't 
> notice
> the thumbnail in the image  before  I used the channel mixer. The image is an
> infrared photo, it's mostly sky and the thumbnail didn't stand enough for me 
> to
> notice it. It's also so tiny that it can't be seen in the image layer page 1.
> After swapping The red and blue channels (not green, another mistake) the
> colours changed enough for the thumbnail to be obvious. I wrongly assumed that
> the channel mixer had created the thumbnail, in fact it was there all the 
> time.
> 
> Now I understand the problem I think I'll be OK, for a while anyway.
> 
> I bought Klaus Goelker's book "GIMP 2.8 for photographers" last week, I'm
> working my way through it and thought I was doing OK, but I got myself too
> confused to sort this one.
> 
> Before installing GIMP I read a review which said that GIMP was a very good
> program, but the learning curve was steep. I  think they were right on both
> points.
> 
> Thankyou for your assistance, I know what I'm going to be doing during the 
> long
> winter nights.
> 
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[Gimp-user] Gimp channel mixer

[Oxonian]

Good morning all,  The image I was working on was created by Nikon's ViewNX2
editor, the original image format was Nikon's raw image .NEF extension, I
exported this as a TIFF and then imported it to GIMP.

In ViewNX2 the images are stored with a preview thumbnail, so I think you have
hit the nail on the head, I got myself confused at first because I didn't notice
the thumbnail in the image  before  I used the channel mixer. The image is an
infrared photo, it's mostly sky and the thumbnail didn't stand enough for me to
notice it. It's also so tiny that it can't be seen in the image layer page 1.
After swapping The red and blue channels (not green, another mistake) the
colours changed enough for the thumbnail to be obvious. I wrongly assumed that
the channel mixer had created the thumbnail, in fact it was there all the time.

Now I understand the problem I think I'll be OK, for a while anyway.

I bought Klaus Goelker's book "GIMP 2.8 for photographers" last week, I'm
working my way through it and thought I was doing OK, but I got myself too
confused to sort this one.

Before installing GIMP I read a review which said that GIMP was a very good
program, but the learning curve was steep. I  think they were right on both
points.

Thankyou for your assistance, I know what I'm going to be doing during the long
winter nights.

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[Gimp-user] Gimp channel mixer

[Oxonian]

>Going for a beer sounds good to me.
>
>There are image formats where the file contains both the image and a
>thumbnail used by some applications to show the image quickly usually
>for selection. That is what you have. Two solutions, trial and error
>to determine the full image or open both and delete the unwanted
>layer.
>
>quote...I'm trying to use the GIMP channel mixer to reverse the red
>and green channels in a TIF image. I'm using GIMP 2.9.6
>
>Might not be as simple as the channel mixer, One way is decompose the
>image to RGB layers.
>
>Duplicate the decomposed image and copy/paste Red from no2 to Green in
>no1.  Green from no 2 to Red in no1
>
>Recompose the first decomposed image.

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[Gimp-user] Gimp channel mixer

[programmer_ceds]

When I open (I don't see an Import option) a tiff file I don't get asked whether
I want to open it as layers. This was a file that I exported as tiff from GIMP.

Which program was used to save the tiff file that you are opening? Could it have
saved the thumbnail as a separate layer rather than as a thumbnail?

If so and this ends up as the active layer it would be the one that the channel
mixer altered as noted in your first post. This would agree with you saying that
the channel mixer will work on the background if you select it.

If the thumbnail is actually a different layer you could simply delete the
layer.

(I have just checked that when I use Export As to save a jpg as a tiff the
advanced option to save the thumbnail is selected but I don't see the same
problem when I open the saved file with GIMP.)

>The problem is not the channel mixer, if I select background I can use
>the channel mixer OK, but the thumbnail is still in the image, my
>problem therefore is importing the image properly, why is the image
>being imported as two pages?
>
>Thankyou for replying so quickly earlier, I did not expect to receive
>a reply on a Saturday evening, I have been looking at a computer for
>too long now, I'm going for a beer, will log on later.

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[Gimp-user] Gimp channel mixer

[rich404]

>The problem is not the channel mixer, if I select background I can use
>the channel mixer OK, but the thumbnail is still in the image, my
>problem therefore is importing the image properly, why is the image
>being imported as two pages?
>
>Thankyou for replying so quickly earlier, I did not expect to receive
>a reply on a Saturday evening, I have been looking at a computer for
>too long now, I'm going for a beer, will log on later.

Going for a beer sounds good to me.

There are image formats where the file contains both the image and a thumbnail
used by some applications to show the image quickly usually for selection. That
is what you have. Two solutions, trial and error to determine the full image or
open both and delete the unwanted layer.

quote...I'm trying to use the GIMP channel mixer to reverse the red and green
channels in a TIF image. I'm using GIMP 2.9.6

Might not be as simple as the channel mixer, One way is decompose the image to
RGB layers.

Duplicate the decomposed image and copy/paste Red from no2 to Green in no1. 
Green from no 2 to Red in no1

Recompose the first decomposed image.

Attachments:
* http://www.gimpusers.com/system/attachments/730/original/decomposed.jpg
* http://www.gimpusers.com/system/attachments/731/original/recomposed.jpg

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[Gimp-user] Gimp channel mixer

[Oxonian]

>I now believe the problem lies with the importing of the image. I have
>been importing fresh images into GIMP, what I had not noticed was that
>the tiny thumbnail is there from the beginning, my image size is
>6016x4000, the thumbnail image is about 150x100 in the top left.
>
>When I import the image a dialogue box opens with the title "IMPORT
>FROM TIFF" The box shows two pages and asks if I want to import them
>as layers or images, I have been importing them as layers. the layers
>appear with the top layer labelled as page 1, and beneath it the main
>image labelled background. If I turn off page 1 the thumbnail
>disappears.
>
>I thought the two images may be the result of my files being too
>large, they are 137MB, under preferences the max image size was set to
>128MB, I upped this to 164MB but it has made no difference.
>  
>If I import the pages as images I get two images, one the full size
>image, the other a very small image, both identical.

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[Gimp-user] Gimp channel mixer

[Oxonian]

The problem is not the channel mixer, if I select background I can use the
channel mixer OK, but the thumbnail is still in the image, my problem therefore
is importing the image properly, why is the image being imported as two pages?

Thankyou for replying so quickly earlier, I did not expect to receive a reply on
a Saturday evening, I have been looking at a computer for too long now, I'm
going for a beer, will log on later.

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[Gimp-user] Gimp channel mixer

[Oxonian]

I now believe the problem lies with the importing of the image. I have been
importing fresh images into GIMP, what I had not noticed was that the tiny
thumbnail is there from the beginning, my image size is 6016x4000, the thumbnail
image is about 150x100 in the top left.

When I import the image a dialogue box opens with the title "IMPORT FROM TIFF"
The box shows two pages and asks if I want to import them as layers or images, I
have been importing them as layers. the layers appear with the top layer
labelled as page 1, and beneath it the main image labelled background. If I turn
off page 1 the thumbnail disappears.

I thought the two images may be the result of my files being too large, they are
137MB, under preferences the max image size was set to 128MB, I upped this to
164MB but it has made no difference.
  
If I import the pages as images I get two images, one the full size image, the
other a very small image, both identical.

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[Gimp-user] Gimp channel mixer

[Oxonian]

>Works for me using 2.9.7 portable used in multi-window mode (commit
>1773cd9) from Partha's site (Windows 7 64-bit)
>
>I just set the red in red to zero and the green in red to 1.0 and vice
>versa then pressed OK. I didn't see a thumbnail but the active image
>changed as expected whilst editing, if I had the preview selected, and
>was changed as expected when I clicked OK.
>
>If this later version gives you the same problem could you list the
>exact steps that you are using and I will see if I can reproduce the
>problem.
>
>If you have the preview option selected does the active image change
>when you alter the channel mixer settings?

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[Gimp-user] Gimp channel mixer

[programmer_ceds]

Works for me using 2.9.7 portable used in multi-window mode (commit 1773cd9)
from Partha's site (Windows 7 64-bit)

I just set the red in red to zero and the green in red to 1.0 and vice versa
then pressed OK. I didn't see a thumbnail but the active image changed as
expected whilst editing, if I had the preview selected, and was changed as
expected when I clicked OK.

If this later version gives you the same problem could you list the exact steps
that you are using and I will see if I can reproduce the problem.

If you have the preview option selected does the active image change when you
alter the channel mixer settings?

>I'm trying to use the GIMP channel mixer to reverse the red and green
>channels in a TIF image. I'm using GIMP 2.9.6.
>
>After swapping the channels etc. and hitting OK, all that happens is
>that a very small thumbnail appears in the top left corner of the main
>image. I can see that the channels have been reversed in the
>thumbnail, but the main image remains unaltered.
>
>I cannot find a way to apply the changes to the main image, I'm very
>new to GIMP and image editing software, so I hope the solution isn't
>something any ten year old child could work out! Any help greatly
>appreciated

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[Gimp-user] Gimp channel mixer

[Oxonian]

I'm trying to use the GIMP channel mixer to reverse the red and green channels
in a TIF image. I'm using GIMP 2.9.6.

After swapping the channels etc. and hitting OK, all that happens is that a very
small thumbnail appears in the top left corner of the main image. I can see that
the channels have been reversed in the thumbnail, but the main image remains
unaltered.

I cannot find a way to apply the changes to the main image, I'm very new to GIMP
and image editing software, so I hope the solution isn't something any ten year
old child could work out! Any help greatly appreciated

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