Fernando Cacciola wrote:
Joel de Guzman wrote:
Joel de Guzman wrote:
Matt Gruenke wrote:
Joel de Guzman wrote:
I disagree. A color space is a tuple of numbers. It is concerned with data and layout as far as I can see. That is the very definition of "tuple".
That's a color (or pixel value).
A color space provides the semantics of these numbers, possibly including how they are converted to other color spaces. This may include its basis, CIE primaries, transfer function, gamut, etc. (For more information, here's a good starting point: http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html )
A pixel format establishes the mapping between channels of an image (i.e. color, pixel value, etc.) and components of a color space. Now I see the confusion. There are overlaps in the definition of
colors and color-spaces of course. Did you think they were orthogonal? See: http://tinyurl.com/18r for the definition of color-spaces.
tinyurl mistake again! One more try:
Regards,
That very same wikipedia article may be used to explain why Matt and I are against using the term "color space" for the GIL element under discussion. If you read it carefully you can see that the "tuple of numbers" is a "color model", not a "color space" (a mapping function binds the model with the space) Reading further down you see that it refers to "RGB", "CYMK", etc as color models, not color spaces.
So at most I would say that the correct term is color model. It certainly isn't color space and that article shows why quite well.
No! Read carefully. Color space is gamut (footprint) + color model. Cheers, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net