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#!/usr/bin/env python
# $URL: http://pypng.googlecode.com/svn/trunk/code/mkiccp.py $
# $Rev: 182 $
# Make ICC Profile
# References
#
# [ICC 2001] ICC Specification ICC.1:2001-04 (Profile version 2.4.0)
# [ICC 2004] ICC Specification ICC.1:2004-10 (Profile version 4.2.0.0)
import struct
# Local module.
import iccp
def black(m):
"""Return a function that maps all values from [0.0,m] to 0, and maps
the range [m,1.0] into [0.0, 1.0] linearly.
"""
m = float(m)
def f(x):
if x <= m:
return 0.0
return (x-m)/(1.0-m)
return f
# For monochrome input the required tags are (See [ICC 2001] 6.3.1.1):
# profileDescription [ICC 2001] 6.4.32
# grayTRC [ICC 2001] 6.4.19
# mediaWhitePoint [ICC 2001] 6.4.25
# copyright [ICC 2001] 6.4.13
def agreyprofile(out):
it = iccp.Profile().greyInput()
it.addTags(kTRC=black(0.07))
it.write(out)
def main():
import sys
agreyprofile(sys.stdout)
if __name__ == '__main__':
main()