Thomas Baumann wrote:
Hello list,when I print a Lab test target through any of my Argyll generated printer profiles there is a peculiarity, most pronounced with relative colorimetric intent: Dark out-of-gamut colors with high b values turn into a light yellow - see file Screenshot_Softproof_Argyll.tif.Example (B2A1, L = 9, a = 0, b = 80):So the problem seems to lie in the gamut mapping [...] from a very dark to a very light yellow.
The problem is that Lab 9/0/80 is not a "very dark yellow" but no color at all. When you take a look at e.g. <http://brucelindbloom.com/LabGamutDisplay.html>, you will find that 9/0/80 is far beyond the gamut of the human vision. I don't know exactly how argyll deals with "virtual" colors like this (I'm sure Graeme can explain it in detail), but a yellow with a much higher L value seems to be a reasonable substitution for this "un-color". Klaus