Re: [darktable-user] Completely lost in colors (again)

2019-06-16 Thread Remco Viëtor
On dimanche 16 juin 2019 13:14:13 CEST Kneops wrote:
> About this:
>  > I guess you could set sRGB as the soft proofing & gamut-check profile
>  > to see (an approximation of) how the picture will look in sRGB and
>  > what's out of gamut for sRGB, respectively.
> 
> When I have my display in Gamut Checking set to my system display or
> explicitely to my monitor display ICC (which is the same) and I set
> softproof even to that same profile, it still shows me colors that are
> outside the Gamut. Actually, no matter what combination I choose (srgb
> as monitor display and adobe as softproof or the other way around) I
> always get to see colors that are out of gamut.
> I don't understand how this works.
> 
> I have a Dell U2713H monitor that covers 99% of Adobe RGB.

The colours displayed are *of course* within the monitor gamut (it can't 
display colours outside its gamut, by definition). And they will also be 
within the export gamut...

So the "out of gamut" display has to consider the colours before the 
application  of the soft-proofing profile to be of any use.

Iirc, the "input profile" module has an option to force colours into a given 
gamut.

Remco



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Re: [darktable-user] Completely lost in colors (again)

2019-06-16 Thread ternaryd
On Sun, 16 Jun 2019 13:14:13 +0200
Kneops  wrote:

> Actually, no matter what combination I
> choose (srgb as monitor display and adobe as
> softproof or the other way around) I always
> get to see colors that are out of gamut. I
> don't understand how this works.

One thing are the colors actually in your
image, and another is, how you tell dt to
display them. If your image, in CIE Lab has
colors which are out of gamut in Adobe RGB,
they are most likely also out of gamut in sRGB.

Try an image with a 50% gray. All out of gamut
should go away.

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Re: [darktable-user] Completely lost in colors (again)

2019-06-16 Thread Kneops

About this:

> I guess you could set sRGB as the soft proofing & gamut-check profile
> to see (an approximation of) how the picture will look in sRGB and
> what's out of gamut for sRGB, respectively.


When I have my display in Gamut Checking set to my system display or 
explicitely to my monitor display ICC (which is the same) and I set 
softproof even to that same profile, it still shows me colors that are 
outside the Gamut. Actually, no matter what combination I choose (srgb 
as monitor display and adobe as softproof or the other way around) I 
always get to see colors that are out of gamut.

I don't understand how this works.

I have a Dell U2713H monitor that covers 99% of Adobe RGB.



Op 12-06-19 om 21:23 schreef KOVÁCS István:

Hi,

On Tue, 11 Jun 2019 at 21:59, Kneops  wrote:

I have a Nikon D850 set to Adobe RGB,


If you shoot raw, colour space in camera does not matter (raw files
record the signal values the sensor measures; it's the job of the
input colour profile to tell darktable how to interpret those
numbers).


and I had my monitor calibrated
with Spider 4, and DT uses this icc file. I checked with darktable-cmstest.

The color in DT of a poppy was very vivid, with a a little magenta in
the red. I exported the image as sRGB for web and as Adobe RGB hirez.

Geeqie (also using the same monitor ICC) shows more red, less magenta.


Since that's already after the output colour transformation, your
output image may not be able to represent all colours in the image.
See https://darktable.gitlab.io/doc/en/darkroom_bottom_panel.html#softproof
and https://darktable.gitlab.io/doc/en/darkroom_bottom_panel.html#gamutcheck).
I guess you could set sRGB as the soft proofing & gamut-check profile
to see (an approximation of) how the picture will look in sRGB and
what's out of gamut for sRGB, respectively.

Also, have you set the display profile in Geeqie preferences?
http://www.geeqie.org/help/GuideOptionsColor.html


Uploaded the image to Instagram and both in Firefox and Chrome the image
looks totally dull and darker and I removed the image immediately. As
far as I know both Chrome and Firefox can read the color profile of images.


Try some tests to see if they are properly set up, e.g.:
https://cameratico.com/tools/web-browser-color-management-test/
http://www.color.org/browsertest.xalter
https://chromachecker.com/info/en/page/webbrowser


What monitor profile should DT use? Adobe RGB? Or the ICC from Spider?


ICC from the Spyder.


Should I unbreak the color profile (initially set to standard color
matrix) and set it manually to Adobe RGB?


If you're shooting raw, leave it alone. If shooting Adobe RGB JPG or
TIFF (non-raw files), you may want to explicitly set it.

Kofa



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