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#!/usr/bin/env python
"""To black and white"""
import inkex
class BlackAndWhite(inkex.ColorExtension):
"""Convert colours to black and white"""
def add_arguments(self, pars):
pars.add_argument(
"-t", "--threshold", type=int, default=127, help="Threshold Color Level"
)
def modify_color(self, name, color):
# ITU-R Recommendation BT.709 (NTSC and PAL)
# l = 0.2125 * r + 0.7154 * g + 0.0721 * b
lum = 0.299 * color.red + 0.587 * color.green + 0.114 * color.blue
grey = 255 if lum > self.options.threshold else 0
return inkex.Color((grey, grey, grey))
if __name__ == "__main__":
BlackAndWhite().run()
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