[argyllcms] Re: eye-one pro Rev A/Rev D IR calibration?

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Wed, 30 Jun 2010 22:48:25 +1000

Gerhard Fuernkranz wrote:
If the white readings happen to be < 1000 at  particular wavelenghts,
then a minimum value of 1000 is still enforced for the denominator,
which I assume will lead to a downwards shrinkage/biasing of the
readings at these wawevelengths. It should be easy, to print out the
write_ref1[] and white_ref2[] numbers in order to verify whether or not
they happen to be < 1000 your case.

Yes, this case is there to avoid low reference readings magnifying
noise, or (ultimately) causing a divide by zero or -ve values.

Graeme Gill.

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