though he uses Rec. 601 Luma coefficients and I get better results with Rec 709 (sRGB)
jsFiddle here: http://jsfiddle.net/HBQrw/
though he uses Rec. 601 Luma coefficients and I get better results with Rec 709 (sRGB)
jsFiddle here: http://jsfiddle.net/HBQrw/