[SOLVED] Help with color management

[Brainslug]

Hi all,

I have been using Aftershot Pro for a while and my life was quite good. Until recently, when someone gave me Colormunki Smile as a Birthday present... Now everything is pretty messed up and I don't seem to be able to resolve this myself, so I am asking the experts here for help.
I'm running Aftershot 1.2.0.7 on Debian Linux. I used the Colormunki to create a color profile for my laptop (Dell Precision M4500) using Argyll v1.5.1 and dispcalGUIv1.2.0.7. I did the same for another laptop (Dell M4400) and when I load the two .icm files in my window manager via colord, a picture displayed on both laptops looks similar enough to make me believe that the .icm files are o.k. (also, a much "warmer" picture, compared to the very blue-ish Dell standard settings). So far so good. Now the part that's broken... As soon as I load the color profile in Aftershot, everything is messed up - green turns into purple and black turn into blue for no reason. I re-created the profiles several times w/ different settings in argyll, but the result is always the same in Aftershot. No other picture editing program I have (GIMP, f-spot) has any problem with loading the profiles and displaying colors correctly.
I am attaching a picture, showing the effect that can be reproduced with any picture that comes off my 5D3, jpg and raw. I also tried opening photos from the web, and the effect shows up on most, but not all pictures.
What am I doing wrong here? Any advice or help? I can attach the .icm file, Argyll settings, or any other information that might be of any help.

Thanks much,
- Brainslug

Top: using the "DefaultMonitor.icm" profile that ships w/ Aftershot
Bottom: using my custom profile

[afx]

Is it a matrix or a LUT profile?
What is the rendering intent in the profile?

cheers
afx

[Brainslug]

Hi afx,

thanks for the quick reply.
It is a matrix profile, option "Curve+Matrix" in Argyll, and the rendering intent is absolute calorimetric. These are the default settings in Argyll, and when I did some reading through various forums and wikipedia in the beginning, it sounded like these are reasonable choices. But I am far from fully understanding all the concepts and details to judge by myself.
I also attach the .icc file in case it contains relevant info.

I really appreciate any help,
- Brainslug

icc.zip

(10.25 KiB) Downloaded 268 times

[afx]

I've loaded your profile on my thinkpad and apart from some expected color changes nothing weird shows up.
iccdump does not reveal any issues.

This is a bit puzzling I must admit.

cheers
afx

[Brainslug]

Thanks for taking the time to look into this, afx. And based on your feedback I was actually able to track down the problem. Since I had never used custom color profiles before I just assumed that Argyll's .icc file was the issue. But after hearing that it works on your Aftershot installation I tried a couple of other things. Turns out that disabling OpenCL in Aftershot fixes the issue! No more purple and blue artifacts. Re-enabling hardware accelleration in ASP immediately brings them back. I am on a NVIDIA Quadro FX 880M card which has never given me any problems on Linux. But ASP seems to be unhappy with it, so I guess I'll just disable OpenCL for now until ASP can handle my graphix cards (NVIDIA QuadroFX 770M also affected).

Thanks again for your help &
Happy weekend,
- Brainslug

[afx]

Interesting, never seen a CM/OpenCL issue before.
But I do have OpenCL disabled on my Linux box with the Nvidia card as it is slower than CPU (quad i7) only. On my Windows box with a FirePro I get a ~ 25% boost....

cheers
afx