[argyllcms] Re: White Point

  • From: Iliah Borg <iliah.i.borg@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sat, 7 Nov 2015 15:27:54 -0500


In floating point, the Teflon tape reads 1.000-1.000-1.000. (As does the
whitest patch of the left/upper part of the ColorCheckerPassport; but
RawDigger shows higher values for the Teflon than for the Passport patch).

You probably have clipping in the raw conversion, since different raw values
are mapped to the same value in the raw converter.

First, it would be good to see the raw file in question (if anything, to get an
idea of the exposure and flare. It may help if there is a shot of the whole
setup, even taken with a phone, to see the locations of the camera, the lights,
the target. Second, if a raw converter clips the highlights, the right thing to
do is to decrease the exposure. If it is a substantial clipping, you may want
to present the case to the developer of the raw converter. Third, what is that
you are using for white balance? Second grey from CCP?

Best regards,
Iliah Borg
LibRaw, LLC

Other related posts: