Glenn Wilton wrote: > What I would like to do is perform a reverse A2B lookup but NOT a B2A lookup > as the printers B2A table only uses 5 data points vs the 33 datapoints for > the A2B Table. >
The command command "xicclu -fif ..." from Argyll CMS can do reverse A2B lookups. But note, in case of a CMYK color space [or in case of any device color space with more than three color components], the result of a A2B reverse lookup is not unique, but there may exist an infinite number of different CMYK combinations, which all result in the same color, when printed. Also keep in mind, that spot colors with higher saturation may be out of gamut on your medium, particularly if the gamut is small, as you said. And your B2A tables really have only 5 grid points? Couldn't you build them with higher resolution? (But basically I agree, that the accuracy of B2A table generally suffers more or less, since the grid points of the B2A table need to cover the whole CIELAB space (even the regions outside the visual gamut), while the A2B table only needs to cover the device gamut, which is only a fraction of the whole CIELAB gamut. An exception are certainly multicolor profiles, which cannot use too many A2B grid points, otherwise they would become too large). Regards, Gerhard ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
