My question was not meant as a criticism or trying to belittle argyll's
approach but reflected the need to clarify the situation for myself and I
thank you for taking the time to reply.
I used the word "agree" within brackets to qualify that there is no need for
such "agreement", as far as I'm concerned, between Adobe and Argyll, other
than to convey the suggestion that *if* a user wants to achieve some sort of
conformance with Adobe, for the sole purpose, say, of comparing results
between their conversions and argyll's, one way to achieve this is to avoid
using AbsCol alltogether in icclu.
icclu's current conversions will never agree with the chopping block
decision that Adobe has made to save their ass from answering tech support
calls to irate customers who couldn't bear their image turning blue on
them. I know, it's a twisted way to stating the obvious.
That's why I was looking for a way to set the
ARGYLL_CREATE_DISPLAY_PROFILE_WITH_CHAD environment variable, as I gather
that this is the only way to get V4 monitor profiles out of Argyll.
I still need to compare "side by side", on equal footing, the result of
Adobe's conversions with argyll's.
BTW, it didn't occurred to me that setting this 'Environment variable' was
the same as setting the Environment variable for the PATH statement...
Now, I understand.
I don't dare ask the obvious, Graeme, it's your product but couldn't you
have added a "Profile Version" switch for a V2 vs V4 profiles for monitors
profile creation, in colprof? That would have been simpler than remove or
add the Environment variable... Not that I plan on switching a lot between
the two types of profiles.
You see, there is an issue I've been trying to nail with Photoshop and it
has to do with converting AbsCol RGB to CMYK.
I observed that this usually results in images with higher constrast.
I use sRGB as the Source and an ISO or IDEAlliance CMYK profile as the
It could be simply a question of clipping the the Source white point but I
am not sure and I have not taken the time to study it rigourously.
That's why I am curious to generate V4 profiles with argyl to compare with
Thank's / Roger
From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Graeme Gill
Sent: Thursday, June 23, 2016 7:23 PM
Subject: [argyllcms] Re: RGB monitor profiles
Roger Breton wrote:
BTW, I have not found how to change the "Environment variable"profiles on Windows?
ARGYLL_CREATE_DISPLAY_PROFILE_WITH_CHAD to change from the default V2
Despite setting Rendering Intent to AbsCol in Color ConversionRelative Colorimetric kind of conversion :
options, in Photoshop's Color Settings, one still gets what looks like a
0.0 0.0 0.0 -> 0 0 0 [Lab]
0.5 0.5 0.5 -> 53 0 0 [Lab]
1.0 1.0 1.0 -> 100 0 0 [Lab]
So the only way for icclu to ever "agree" with Photoshop, out of
Argyll V2 monitor profiles, is to stick with Relative Colorimetric intent?