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Diffstat (limited to '')
-rwxr-xr-x | share/extensions/color_blackandwhite.py | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/share/extensions/color_blackandwhite.py b/share/extensions/color_blackandwhite.py new file mode 100755 index 0000000..e5e65b2 --- /dev/null +++ b/share/extensions/color_blackandwhite.py @@ -0,0 +1,24 @@ +#!/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() |