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Conversion to L

This step applies only to RGBA component groups, and only if the format is either LUMINANCE or LUMINANCE_ALPHA. A value L is computed as

where R, G, and B are the values of the R, G, and B components. The single computed L component replaces the R, G, and B components in the group.

David Blythe
Sat Mar 29 02:23:21 PST 1997