color spaces

[Ralf Gommers]

Hi all,

I'm working on the color spaces, and would like some feedback. Doing color
space conversions is very simple, but finding the right references and
making sure things are correct is a real pain. So I'm wondering what spaces
are useful and unambiguously defined.

So far I have
-----------------
- RGB : sRGB with D65 whitepoint, the "central" color space in the API.
- HSV : unambiguous
- XYZ : unambiguous
- CIE RGB : unambiguous
- RGB NTSC : from Travis' code, not sure what it is. Not equal to YIQ, which
is the color space used for NTSC. Will delete again unless I figure it out.

Some code, seems clearly defined
----------------------------------------------
- CIE LAB
- CIE LUV

Some code, but not sure about
-----------------------------------------
- RGBP : gamma corrected sRGB. I am usually interested in intensities /
photon counts, so I have a natural aversion to this one. Anyone care?
- YIQ : see RGB NTSC above
- RGB SB : Stiles and Burch (1955) 2-degree RGB color space. seems obsolete.
- UVW : seems obsolete
- YUV / YCbCr / YCC / YPbPr / 8-bit YCbCr : these are all similar and often
confused. A mess.

No code yet, but commonly used
--------------------------------------------
- HSL
- CMYK


The code I have so far lives here:
http://github.com/rgommers/scikits.image/tree/color

I'm afraid adding color spaces that are not clearly defined does more harm
than good, so please let me know which color spaces are useful for you.

Cheers,
Ralf
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