Wikibooks

Rebol Programming/brightness?

< Rebol Programming
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USAGE:

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BRIGHTNESS? color

DESCRIPTION:

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Returns the monochrome brightness (0.0 to 1.0) for a color value.

BRIGHTNESS? is a function value.

ARGUMENTS

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  • color -- (Type: tuple)

SOURCE CODE

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brightness?: func [
    {Returns the monochrome brightness (0.0 to 1.0) for a color value.} 
    color [tuple!]
][
    (0.27 * color/1) + (0.63 * color/2) + (0.1 * color/3) / 255
]
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