SCALE 8x: Color management for everyone
Posted Mar 4, 2010 14:28 UTC (Thu) by farnz
In reply to: SCALE 8x: Color management for everyone
Parent article: SCALE 8x: Color management for everyone
sRGB isn't the only standard RGB colourspace. Just off the top of my head, I can think of sRGB, Adobe RGB, BT.709 RGB, CIE 1931 RGB and I'm sure there are more out there. I can very easily find images in three of those colourspaces (my digital camera can produce two of them, I can get a third by grabbing a frame from BBC HD and converting from YUV to RGB).
Plus, many images aren't in an RGB colourspace to begin with; if the image is CMYK (common if it's being prepared for print), or some variation on YCbCr (common if it's from TV). The application needs to tell the graphics driver about all of this information if you're to get a precise match; what's more, not all colour values are in 8-bits per channel RGB; if I had 16-bit per channel CMYK, I'd like the graphics driver to know that I want a slightly darker red than the RGB tuple suggests, so that it knows which way to round error.
This becomes more important on 30-bit displays (where an RGB tuple is three ten-bit values, not three 8-bit values), as the conversion formulae are not precise, and it would be nice to use the extra accuracy to improve colour reproduction.
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