This howto is incomplete and untested (but might work, though).
In a related howto I described how to use the ICC profiles that come with Canon Digital SLR (EOS) together with UFRaw to digitally develop colour calibrated photographs. This howto will describe how you can use the QPcard 201 and LPROF to create your own ICC profile that describes the lighting conditions of a photo session. This profile can then be used to further correct the colour of you pictures.
You will need:
See also:
~/.lprof/target_refs/
.
~/.lprof/templates/
.~/.lprof/target_refs/
.