[argyllcms] Re: RGB Printer profile shadow detail issues
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 8 May 2020 15:05:06 +1000
Alexey Gribunin wrote:
If you take a look on ti3 gamut, you will find strange spike at the deep
shadows.
I made screenshots of (1430-2Step)
(B_1430_PC+IJMKp_Fnst-PLustr_PPSG_PRH_1792A2.ti3)
Yep - it's going to hard to have a smooth black with such
a transition in the devices behvior, while not clipping
the gamut at the dark end.
So the separation the printer is using (from RGB -> CMYK) is not
setup very well. You may have limited control over it,
but that's where to look.
VRML from ti3 file can be created directly with this simple string:
colverify.exe -v -W -x Measurements.ti3 Measurements.ti3
Spike is perfectly visible on 3D view.
Yes, it's pretty strange. The neutral axis seems to be
treated differently, resulting in the spike.
Cheers,
Graeme Gill.
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