for image in images:
ref_image = ref_prefix + image
src_image = src_prefix + image
root, ext = os.path.splitext(src_image)
delta_image = "%s.diff.png" % (root, )
if os.path.exists(ref_image) and os.path.exists(src_image):
for image in images:
ref_image = ref_prefix + image
src_image = src_prefix + image
root, ext = os.path.splitext(src_image)
delta_image = "%s.diff.png" % (root, )
if os.path.exists(ref_image) and os.path.exists(src_image):