🚀 go-pugleaf

lou,

the discussion is helpful, thanks. But it's hardly possible
to discuss all the details.
I don't think that one needs ink limits for single channels
(see below).
In my workflows the linearization happens for unlimited
C,M,Y and K. Then the TIL target is printed and interpreted
by appearance. RIP-TIL is defined in advance to printing the
calibration target.
So far for ColorGate ProductionServer. Instead of the
built-in profiler I'm using ProfileMaker.
I think it doesn't hurt if I define here an additional TIL,
preferably a little lower than the RIP-TIL.
K can be limited below 100, but so far this wasn't necessary
or useful.

Meanwhile I've finished the gamut volume visualization,
chapter 9 here:
 <http://www.fho-emden.de/~hoffmann/labproof15092008.pdf>

It turns out that one has to compare RGB gamuts and CMYK
gamuts in planes L*=const not for the same L* as done in
ProfileMaker GamutView. RGB-white is mapped to paper white
(RelCol) and RGB-black to the darkest printable black (BPC).
Given RGB-L*, the gamut boundaries for CMYK have to be shown
for a corrected CMYK-L* value.
The darkest L* is about 3.7 for an inkjet. Rather low, but
that's in the CLUT. PM GamutView tells me something between
7 and 8. Measuring the target print by DTP22 delivers values
below 5. All that is probably at the instrument's limits.
But it's safe to say that the achievable inkjet density is
considerably higher than that of offset processes.

Isn't the functionality of ColorLab integrated in PM ?

Best regards --Gernot Hoffmann