[argyllcms] Re: Avoiding whitepoint scum dot in collink?
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sun, 26 Feb 2017 12:15:25 +1100
Stephen Marsh wrote:
I believe that you are telling me to enter the following command:
xicclu -ff -ia -pj -c …
Sorry, to be complete:
xicc -ff -ia -pj profile.icc
and to make it more accurate, add in the same -c parameter as you used
(if any) in your icclink -d parameter.
For RGB white, enter
1 1 1
for CMYK white enter
0 0 0 0
Start with the resulting Jab as the -w paraetmer, and adjust by eye
if needed for your target white emulation, if any.
So J is luminance (i.e 0.0 to 100.0), a is red/green (-ve .. 0.0 +ve),
b is yellow/blue (-ve .. 0.0 .. +ve). 1 unit is a just noticeable difference.
I am sure that I am not the first person to have asked this question, however
as a first
time user I am spinning my wheels! As this is a CMYK > CMYK link, my
expectation from
other software would be to simply enter 0 0 0 0 CMYK device values in the link
generation
whitepoint field.
It's intended for fine tuning paper emulation, since the accuracy/consistency
of the
instrument readings will only take you so far, and a perceptual colorspace is
more
convenient for doing that, and it will work for any device space in & out.
As a newb, It would be appreciated if somebody could point me to a specific
list archive
title or date or spell out in simple step by step points what is required.
It's a more advanced feature, and I can't recall if it's come up before.
HTH,
Graeme Gill.
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