Pillow/Tests/test_image_point.py
2014-07-28 21:49:11 -07:00

49 lines
1.4 KiB
Python

from helper import unittest, PillowTestCase, lena
import sys
class TestImagePoint(PillowTestCase):
def test_sanity(self):
im = lena()
self.assertRaises(ValueError, lambda: im.point(list(range(256))))
im.point(list(range(256))*3)
im.point(lambda x: x)
im = im.convert("I")
self.assertRaises(ValueError, lambda: im.point(list(range(256))))
im.point(lambda x: x*1)
im.point(lambda x: x+1)
im.point(lambda x: x*1+1)
self.assertRaises(TypeError, lambda: im.point(lambda x: x-1))
self.assertRaises(TypeError, lambda: im.point(lambda x: x/1))
def test_16bit_lut(self):
""" Tests for 16 bit -> 8 bit lut for converting I->L images
see https://github.com/python-pillow/Pillow/issues/440
"""
# This takes _forever_ on PyPy. Open Bug,
# see https://github.com/python-pillow/Pillow/issues/484
#self.skipKnownBadTest(msg="Too Slow on pypy", interpreter='pypy')
im = lena("I")
im.point(list(range(256))*256, 'L')
def test_f_lut(self):
""" Tests for floating point lut of 8bit gray image """
im = lena('L')
lut = [0.5 * float(x) for x in range(256)]
out = im.point(lut, 'F')
int_lut = [x//2 for x in range(256)]
self.assert_image_equal(out.convert('L'), im.point(int_lut, 'L'))
if __name__ == '__main__':
unittest.main()
# End of file