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# hexagon5un/gamma.py

Last active January 12, 2024 20:14
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 ## Creates a gamma-corrected lookup table import math def gamma(nsteps, gamma): gammaedUp = [math.pow(x, gamma) for x in range(nsteps)] return [x/max(gammaedUp) for x in gammaedUp] def rounder(topValue, gammas): return [min(topValue, round(x*topValue)) for x in gammas] if __name__ == "__main__": myGamma = 2.3 steps = 16 output = open("gamma.h", "w") output.write("/* %d-step brightness table: gamma = %s */ \n\n" % (steps, myGamma)) output.write("const uint8_t gamma_table[%d] = {\n" % steps) for value in rounder(255, gamma(steps, myGamma)): output.write("\t %d,\n" % value) output.write("};\n") output.close()

### Steve8291 commented Dec 30, 2023

Thanks for putting this together. It was very helpful.
I think there is a typo in line 14. Should read:
`output = open("gamma.h", "w")`

### hexagon5un commented Jan 12, 2024

Thanks for putting this together. It was very helpful. I think there is a typo in line 14. Should read: `output = open("gamma.h", "w")`

Thanks, and fixed.
BTW: that's no typo -- that's history! I must have written this before Python 3. Back then, `open` was `file`.

Surprised the rest still works, but it does. Woot.