Re: [Algorithms] RGB to XYZ conversion

[Jon O. <jon...@gm...>]

Hi Dan,

This website has a good list of color space conversions.

http://www.easyrgb.com/math.html

Enjoy!

Best,
Jon Olick

On Sun, Apr 20, 2008 at 11:54 PM, Dan Glastonbury <dan...@gm...>
wrote:

> Dear colour space experts
>  What matrix should I being using to convert RGB values to CIE XYZ?
> Christer Ericson (http://realtimecollisiondetection.net/blog/?p=15)
> gives the following matrix:
>
>  M = [0.497,0.339,0.164]
>      [0.256,0.678,0.066]
>      [0.023,0.113,0.864]
>
> to be used in [X Y Z] = [R G B]*M and I assume this comes from Greg
> Ward's paper.  Charles Poynton's ColorFAQ and wikipedia's article on
> CIE 1931 give different formulations for the conversion.
>
> Bruce Lindbloom's site
> (http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html)
> gives more than a dozen different conversion matrices, one of which is
> labelled "sRGB" and leads me to believe this should be used for images
> authored to sRGB.
>
> My question to people more knowledgeable than I: Which of the
> conversions should I be using?
>
> thanks
> DanG
>
> --
> Dan Glastonbury, Dan dot Glastonbury at gmail dot com
> `Pour encourjay lays ortras'
>
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