[argyllcms] Re: Generated camera profile too bright

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Tue, 03 Apr 2012 22:34:05 +1000

Ridouan Agarad wrote:
> Looking at this pdf
> (http://www.adobe.com/digitalimag/pdfs/linear_gamma.pdf) it looks like
> your linear tiff is actually as expected...

Not at all - if you look at the histogram there are values that
go over 50%. The lack of gamma correction may make it look dark
on a gamma affected display, but the range of levels
is the right order of magnitude - the maximum is way over 16%.

My guess is that somewhere along the way a 14 bit raw image
has been simply cast to 16 bits rather than scaled, leaving
the image about 1/4 the level it should be.

Graeme Gill.

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