Convert a matrix of points in Lab color space to RGB points.
matrix of row-elements (points in Lab color space, L should scale in [0,100], and (a,b) in [-110,110]).
matrix of row-elements (points with R, G and B values in [0,1]).
This transform is based on ITU-R BT 709, using the D65 white point reference. See http://fr.wikipedia.org/wiki/Rec.(underscore)709 for details. also see http://www.easyrgb.com/index.php?X=MATH
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