gamma.py

## 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()

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 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.