imColorLightness2Luminance

Converts Lightness (CIE L*) to Luminance (CIE Y) (all linear). \n * The white point is D65. \verbatim 0 <= Y <= 1 ; 0 <= L* <= 1

fY = (L + 0.16)/1.16 if (fY > 0.20689) Y = pow(fY, 3) else Y = 0.1284 * (fY - 0.16/1.16) Y = Y * 1.0 (for D65) \endverbatim * \ingroup color

version(IM)
nothrow @nogc @safe
float
imColorLightness2Luminance
(
ref const(float) L
)

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