Hi When using targen whit option -c , nearly stops after about 500 added. Whitout the -c it run for about 1-2 min. F:\Proove_matte_180>targen -v -d4 -g16 -f2140 -c proove_matte_180_preprof_A5_cmyk__520.icm outfile CMYK test chart Compostie Grey steps = 16 Full spread patches = 2140 Ink limit = 349.4% (underlying 349.4%) Adaptation weights: Device = 0.350, Perceptual = 0.650, Curvature = 1.000 Perceptual cache resolution = 7 Acceleration grid res = 7 There are 16 unique fixed points to add (19 non-unique) There are 2121 far spread points to add Added 529/2137 cheers //Magnus --