Re: [Gimp-developer] Show clipped and out of gamut colors using blinking colors

[Elle Stone <ellestone ninedegreesbelow com>]

On 10/20/2017 09:18 AM, Alexandre Prokoudine wrote:
> On Fri, Oct 20, 2017 at 4:03 PM, Elle Stone wrote:
>
> > http://gimp.1065349.n5.nabble.com/GIMP-2-9-useability-out-of-gamut-and-HDR-channel-values-td45195.html#a45198
>
> > - there was a suggestion that this functionality already exists, but if it
> > does, I can't find it :) .
>
> Color managements prefs
>
> Alex

Hi Alex,

Do you mean the "Mark out of gamut colors" option under soft proofing? 
That would only work if the following were true:

1. The user picked the current editing color space as the color space 
for soft proofing.

2. LCMS soft proofing would need to show out of gamut colors when the 
source and destination color space have the same bounded color gamut, 
which currently is not the case. Leastways right now I'm looking at an 
image with hugely out of gamut channel values, with the appropriate soft 
proofing settings in Preferences. Not a single pixel is marked as out of 
gamut.

3. For cases where the user has chosen linear precision, LCMS soft 
proofing would need to work properly for linear RGB, which currently is 
not the case. As an aside, for using LCMS for soft proofing and gamut 
checks, it would be better if the RGB values sent to LCMS were at 
"perceptual precision", regardless of what precision the user has chosen.

Even if LCMS soft proofing changed in the future, the gamut check 
doesn't differentiate between clipped/oog shadow colors and clipped/oog 
highlight colors.

Using LCMS to check for out of gamut colors does slow down the speed at 
which GIMP can display changes in the image made while editing.

Also going into Preferences is a bit cumbersome for something the user 
might not want to leave permanently activated. Buttons/checkboxes 
similar to what the raw processors use would be very much more convenient.

Elle