Re: [Gimp-user] color management -- basic question

[Casey Connor <gimp-user-list caseyconnor org>]

Thanks again, Partha! As a recent convert to LCH, Elle's version looks 
pretty amazing. I'm a little nervous to mess with my gimp install, as a 
non-sysadmin expert, but if Elle has the time to respond maybe she can 
let me know if there'd be value in trying her version. (I get the 
impression from her page on the subject that 2.9.5 has all the same 
color management stuff in it that her version does.)

It's not at all crucial to my workflow that the rendering intent be 
obeyed, I was just curious what was going on, because I thought I 
understood it and the results seemed to imply that I didn't. I wasn't 
sure if this was a flaw in my thinking or gimp.

-c

On 01/08/2017 04:47 PM, Partha Bagchi wrote:
> Try Elle Stone's color corrected experimental version. See if that 
> helps. CCing her in case.
>
> On Sun, Jan 8, 2017 at 6:37 PM, Casey Connor 
> <gimp-user-list caseyconnor org 
> <mailto:gimp-user-list caseyconnor org>> wrote:
>
>     Hi -- basic color management question here; this is gimp 2.9.5
>     (commit 00faf17965) on Linux.
>
>     If I open a colorful image and assign a ProPhoto profile to it,
>     the colors get blown out, as expected.
>
>     If I set the monitor profile to various color profiles, the colors
>     shift around, as expected.
>
>     If I set the monitor profile to sRGB, and then try all the various
>     rendering intents, the colors never change, which
>     surprises/confuses me.
>
>     My expectation was that since gimp is interpreting the colors of
>     the image as being in the ProPhoto space, and I've told it that
>     the monitor is in sRGB, changing the rendering intent should
>     change the displayed colors as it shifts them to be in-gamut for sRGB.
>
>     I understand (from the tooltip) that I shouldn't expect preceptual
>     vs. relative colorimetric to exhibit a difference, but shouldn't I
>     see a change with both saturation and absolute colorimetric?
>
>     Thanks for any help!
>
>     -c
>
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