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Data Range Scaling
White and black references define the encoding range
for device-dependent color spaces. However, device-
independent color spaces require input data pre-scaled to
the range 0 to 255. For example, to use the short form for
the default YUV color space, the input data must have the
following ranges:
Y = 0.0 to 1.0
U = –0.89 to 0.89
V = –0.70 to 0.70
The user must linearly scale (y = mx + b) the input data to
the range 0 – 255:
Y = 0 (0.0) to 255 (1.0)
U = 0 (–0.89) to 255 (0.89)
V = 0 (–0.70) to 255 (0.70)
2-16 Using Color Modes2-16 Using Color Modes