Re: [Gimp-developer] Luminosity in LAB does not agree with Wikipedia or Matlab
- From: "David Gowers (kampu)" <00ai99 gmail com>
- To: Estudiante Magíster en Computación <stecnico0506 hotmail com>
- Cc: gimp-developer-list gnome org
- Subject: Re: [Gimp-developer] Luminosity in LAB does not agree with Wikipedia or Matlab
- Date: Mon, 19 Dec 2011 08:52:39 +1030
What you have not quite said, Richard, is that this adjustment is the one that you would need in order to correct linear RGB to standard sRGB -- so the output of GIMP is not gamma corrected. IMO this is correct, since gamma-correcting would introduce inaccuracies and also reduce precision (which in this case is already limited to 1/256.). The wikipedia images are based on converting the L to rgb by treating the AB channels as if they were zeroed. This produces an image that *looks* accurate but is mathematically inaccurate.
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