feat: add luminance
variable to FlxColor
#3357
Merged
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Luminance is the "perceived" brightness of a color. Where computers treat/calculate RGB values the same, the human eye is more sensitive to green light, so our
get_luminance
getter weighs green stronger than red or blue in a brightness calculation.rgb -> luminance from here: https://www.w3.org/TR/AERT/#color-contrast