[sugar] how to make a grayscale image?

Albert Cahalan acahalan
Thu Nov 1 22:16:45 EDT 2007

Eben Eliason writes:

> Roughly speaking, you can calculate a colored pixel's effective
> luminance by:
> Y = 0.3*R+0.59*G+0.11*B

To be clear on why this is rough: it performs an operation
on non-linear data which is only valid on linear data.
That is, it ignores gamma.

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