Nikolay Pokhilchenko wrote:
When I use "targen -d4 -m6" I know, that all patches will be placed in device space at nodes of linear 4-dimensional grid (6^4=1296 patches). In this case is no difference which channel C,M,Y or K is. The path spread will be equal between channels. But what is going on when I use "targen -d4 -c preprof.icc -A0.8"? Is there preprof.icc black generation used? Which kind of black generation is in targen with pre-conditioning profile? I know, that the keys -r and -R, -i and -I are lead to different spread in device gamut. Is the black generation method depend on the any targen parameters?
There is no black generation for the targets. They explore the CMYK space - ie. it's a 4 dimensional characterization of the device. Black generation is done in the profile creation of the B2A tables. Graeme Gill.