[argyllcms] Re: Black turning down problem - help!
- From: Elena [service address] <1007140@xxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 06 Jan 2011 19:09:48 +0100
Hello Graeme
On 7-Jan-2011, Graeme Gill wrote:
> 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.
Ok, so let's assume the given -kp and -L parameters for colprof are
just taken as maximals. But the K being monotonically increasing
(first derivative never being <0, put it this way) is something that
must be always granted - UNLESS (but this doesn't seem the case) the
specific K ink and paper combination actually causes density
decreasing after, let's say, and high value as 80% or 90%. It's
definitely not possible with the printing scheme I use. I would have
limited it at linearization stage, if so.
> Without the .ti3 data in order to duplicate your results, I can't easily help
> you.
No problem:
http://www.elenadomain.it/pub/argyll/ofps.ti3
this is the first measurement made to
targen -s21 -g21 -f1300 -L310
and
http://www.elenadomain.it/pub/argyll/ofps2.ti3
this is the second iteration reading
targen -s21 -g21 -f1300 -L310 -cofps1.icm
Thanks,
/&
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