Cory Papenfuss wrote:
Just as an aside, I figured there was no inherent reason to limit the
target to just an IT8, so I tried to generate one with argyll's targen
and printtarg. Got a target and cal file, but coulnd't figure out how
to make the equivalent of an .ITX target that lprof liked.
Printtarg can optionally generate a template for scanin. It should be
possible to write a program which converts a scanin template to an lprof
picker template.
It's got potential to make LOTS of color points for monitor calibration.
For a LCD, yes, you'll likely need rather many samples. But many CRT
monitors can be characterized reasonably accurate with a simple
Matrix/GGO model - and such a model has only 5x3 degrees of freedom (if
the "upper right end" of the TRC is constrained to [1,1]), so five
independent samples should be basically enough in order that the problem
is not underdetermined and the model parameters can be solved. Of course
that's an absolute minimum, and more samples are better in order to
average out measurement errors, spatial variations, etc.
(Btw, depending on the chosen number of orders used for modeling the
TRC, Argyll's shaper model may have some more degrees of freedom than
GGO, but it is still a rather reasonably low number)
Regards,
Gerhard
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