Hello: I'm trying to do a workflow for black and white printing. I am using the "print grey" option of targen: targen -v -d0 -f90 BW-Profile printtarg -v -iCM -a1.0 -pA4 BW-Profile colprof -v BW-Profile But when I enter in colprof, I get the error: ³Error - Output device input file has unhandled color representation 'K_XYZ'² I have read a previous answer about a similar problem: ³As noted in the documentation, Argyll doesn't currently handle more than CMYK profiles. Graeme Gill.² OK! but, it is possible to do monochrome printing profiles? what is the right way to create a print test chart for Black and White profiling ? Thanks Jose Pereira