Talk:Brainstorming/Color transformations in YCbCr space

Terminology
Let's do what the Samadani paper does and use "YCC" as a generic term for any colour space with one luminance and two colour difference channels. It's probably OK to abbreviate "YCbCr" to "YUV" in code.


 * Call the two colour difference channels together the "chrominance" of a colour ('chroma' has meanings in other colour spaces).


 * "Lightness" means the subjective brightness perception of a coloured object, and anything encoded to match it regardless of whether it's gamma-compressed.


 * "Luminance" means the linear, non-gamma-compressed, representation of lightness, and is denoted by Y everywhere.


 * "Luma" means the nonlinear, gamma-compressed, representation of lightness, as stored in PNG files and used internally by MyPaint's tile matrices, and is denoted by Y' everywhere.

--Achadwick 21:06, 4 March 2012 (UTC)