[argyllcms] Re: basic icc profile for printer output using 24 patches?

Lars Grobe wrote:


I have a Macbeth Colorchecker at hand (the 24 patches one used mainly by 
fotographers). I know

> that this is not perfect, but still I imagine that calibrating according to 
it may eliminate some
> problems with color matching.


Is it possible to make Argyll use this target, e.g. if I know the values of the 
patches? I have

> those of the chart and those of the printout (both scanned by the same 
device), so a basic
> matching table for creating a profile should be possible, right?

Input targets such as the Colorchecker are not normally usable for profiling 
output
devices such as printers. Output devices are profiled by printing out a set of
known device value patches, and then reading the resulting color using
a color measurement instrument.

A device profile is a mapping between device values (typically CMYK or RGB)
and the CIE device independent color values (typically XYZ or L*a*b* PCS 
(Profile
connection space)). A device to device color transformation is the result
of linking two device profiles, and only at that point are
colors typically translated or "matched".

A single device profile can be used to translate between PCS and
device values, so it is sometimes possible to print an equivalent
of something like the Macbeth Colorchecker if you know it's
XYZ or L*a*b* values, and use this as a verification mechanism
for a profile, if you have a D50 viewing environment in which
to do the visual check. This doesn't help you make the profile
in the first place though.

Graeme Gill.

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