[argyllcms] Re: negative primaries

  • From: Keith Winstein <keithw@xxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sun, 6 Jun 2010 21:48:43 -0400 (EDT)

On Sun, 6 Jun 2010, Ben Goren wrote:

On 2010 Jun 6, at 1:51 PM, Elle Stone wrote:

But really even ProPhoto isn't big enough for all images.

It's even worse than that, I'm afraid.

The spectrum locus lies at least partially outside both Lab and XYZ color spaces. That is, there are huge swaths of spectrally-pure colors that no color space in use today can encode without clipping.

Ben, are you sure? I was pretty sure that the XYZ and xyY spaces were designed to represent any color in the spectral locus with positive values. The diagrams in Wikipedia's "CIE 1931 color space" seem to agree although of course it could be wrong.


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