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Next: Modifying Saturation Up: 13.2.4 The Color Matrix Previous: Scale and Bias   Contents Conversion to Luminance

Converting a color image into a luminance image may be accomplished by scaling each component by its weight in the luminance equation.

L \\
L \\
L \\
R \\
G \\
B \\

The recommended weight values for $R_w$, $G_w$, and $B_w$ are $0.3086$, $0.6094$, and $0.0820$. Some authors have used the values from the YIQ color conversion equation ($0.299$, $0.587$, and $0.114$), but Haeberli notes that these values are incorrect in a linear RGB color space.[42]