Inkscape - Less Contrast effect

import coloreffect

class C(coloreffect.ColorEffect):
  def colmod(self,r,g,b):
    return '%02x%02x%02x' % (((r*0.75)+(255*0.25)),((g*0.75)+(255*0.25)),((b*0.75)+(255*0.25)))

c = C()
c.affect()