Hello, does ColorThink v3.0.5 work correct with ICC v4 printer profiles. I mean the curves Neutral rendering Chroma is showing bluish cast and nonsense values. Profile built with i1profiler
Hi Joe,
CTP 3.0.5 should open v4 profiles fine… but, it can have white point problems on newer macOS versions.
If you’re on a Mac, try downloading the newer version available here:
If you continue to have issues, please DM the profile to me and we’ll take a look
Steve
The wtpt tag in the profile will specify the “White Point” values you see in the Overview tab
V2
Blockquote
XYZ: 0.8422699, 0.88346863, 0.72975159
Lab: 95.3068007, -1.8068409, -0.0617904
LCH: 95.3068007, 1.8078972, 181.9586408
Yxy: 0.8834686, 0.343015, 0.3597932
Luv: 95.3068007, 0.2069008, 0.4882974
5100B0K
Blockquote
V4
Blockquote
XYZ: 0.8422699, 0.88346863, 0.72975159
Lab: 95.3068007, -1.8068409, -0.0617904
LCH: 95.3068007, 1.8078972, 181.9586408
Yxy: 0.8834686, 0.343015, 0.3597932
Luv: 95.3068007, 0.2069008, 0.4882974
5100B0K
Blockquote
The D65 was selected for both profiles. Tags look the same. Why they are shown different, bug in Colorthink?
OK, now you have me wondering what’s going on.
Can you DM me the two profiles? I’ll take a closer look
thanks
Steve
What do you mean “DM” ? I’m unable to find how to send you PM.
Nevermind, here is the two profiles
Still waiting for reply, is the profile OK, bug in CTP or bad profile?
We’re still working on this. No firm answer yet. I do know that with version 4 profiles, the “computation steps required for the media White Point Tag were clarified in V4.” That should make version 4 profiles more trustworthy if anything. We’ll figure it out and get you an answer.
Hi Joe,
I’ve been able to confirm the problem on Windows. It’s related to the CMM used in ColorThink and some version 4 profiles.
Interestingly, it doesn’t happen in the Mac version even though the code and (in theory) the CMM are the same…
So thanks for the heads up. We’ll work on a fix
Steve