share/extensions/color_negative.py

   1 #!/usr/bin/env python
   2 import coloreffect
   3
   4 class C(coloreffect.ColorEffect):
   5   def colmod(self,r,g,b):
   6     return '%02x%02x%02x' % (255-r,255-g,255-b)
   7
   8 c = C()
   9 c.affect()