Hi! > Yes, I think that how you describe luminance and lightness is right, > and sounds good improve the doc. > > To be clear the correction table for PWM values can be calculated with > this code. > > OUTPUT_SIZE = 65535 # Output integer size > INPUT_SIZE = 2047 > > def cie1931(L): > L = L*100.0 > if L <= 8: > return (L/902.3) > else: > return ((L+16.0)/116.0)**3 > > x = range(0,int(INPUT_SIZE+1)) > y = [int(round(cie1931(float(L)/INPUT_SIZE)*(OUTPUT_SIZE))) for L in x] Can we just generate the table on the fly? Should not be hard to do in fixed point, right? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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