A method of producing a color space transformation, with which the color
values of a first printing process can be converted into the color values
of a second printing process so that the black build-up of the first
printing process is substantially transferred into the second printing
process and the visual impression of the printed colors in the two
printing processes is substantially the same, includes characterizing the
color reproduction characteristics of the printing processes by color
profiles, which specify an association between the device dependent color
values of the printing processes and the color values of a device
independent color space. From the color profiles, lightness curves are
determined as a function of the black printing ink and color curves are
determined as a function of the non-black printing inks and linked to form
the color space transformation sought.
