srgblut.py

from math import pow

def linear_to_srgb(c):
    if c < 0.0031308:
        return 12.92 * c
    return 1.055 * pow(c, 0.41666) - 0.055

def srgb_to_linear(c):
    if c < 0.04045:
        return c / 12.92
    return pow((c + 0.055) / 1.055, 2.4)

def lut(fn):
    return [int(255.0 * fn(i / 255.0) + 0.5) for i in range(256)]

print 'static const uint8_t LINEAR_TO_SRGB[256] = {' + ', '.join(str(i) for i in lut(linear_to_srgb)) + '};'
print 'static const uint8_t SRGB_TO_LINEAR[256] = {' + ', '.join(str(i) for i in lut(srgb_to_linear)) + '};'