77     def __init__(self, make_frame=None, ismask=False, duration=None,  argument
87         self.ismask = ismask
520         if self.ismask and picture.max():
564         return blit(img, picture, pos, mask=mask, ismask=self.ismask)
577             mask = ColorClip(self.size, 1.0, ismask=True)
581             mask = VideoClip(ismask=True, make_frame=make_frame)
661         assert mask is None or mask.ismask
716         newclip = ImageClip(self.get_frame(t), ismask=self.ismask,
724         if self.ismask:
729             newclip.ismask = True
734         if self.ismask:
737             newclip.ismask = False
784     def __init__(self, data, data_to_frame, fps, ismask=False,  argument
790         VideoClip.__init__(self, make_frame, ismask=ismask,
828     def __init__(self, world, ismask=False, duration=None):  argument
837                            ismask=ismask, duration=duration)
884     def __init__(self, img, ismask=False, transparent=True,  argument
886         VideoClip.__init__(self, ismask=ismask, duration=duration)
896                 elif ismask:
900                         1.0 * img[:, :, 3] / 255, ismask=True)
902             elif ismask:
1002     def __init__(self, size, color=None, ismask=False, duration=None, col=None):  argument
1015                            ismask=ismask, duration=duration)