[argyllcms] Re: Black turning down problem - help!
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 07 Jan 2011 00:51:55 +1100
Elena [service address] wrote:
I don't feel to play with too many K curves since I noticed that colprof
doesn't actually fully obeys my rules. If I state for example -kp 0 0 1 1 .5
and also -l300 -L100, colprof shouldn't for any reason limit the K max level
(it does instead) or, worst, change its monotonic increasing.
I doubt the K value is at all limited. Given the device behaviour
and maximum ink value, it simply have no need to use the maximum value.
There is no intention to force K to be monotonic with respect to
the L* value. K is whatever it needs to be to hit the target PCS
value, within the limits imposed.
However, please explain me why this strange behavior of xicclu:
plotting -g with -fb -ir does show the K turning down, while plotting the
perc. intent gray (-g -fb -ip) DOESN'T (see previous pictures) - BUT, if you
measure the C,M,Y,K values in the rgb->CMYK picture converted with Perc. intent,
you actually SEE the black ramping down! Is it a bug ??
Without the .ti3 data in order to duplicate your results, I can't easily help
you.
Graeme Gill.
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