Pillow/Tests/test_imagepalette.py
2017-04-20 21:14:23 +10:00

144 lines
3.7 KiB
Python

from helper import unittest, PillowTestCase
from PIL import ImagePalette, Image
ImagePalette = ImagePalette.ImagePalette
class TestImagePalette(PillowTestCase):
def test_sanity(self):
ImagePalette("RGB", list(range(256))*3)
self.assertRaises(
ValueError, lambda: ImagePalette("RGB", list(range(256))*2))
def test_getcolor(self):
palette = ImagePalette()
test_map = {}
for i in range(256):
test_map[palette.getcolor((i, i, i))] = i
self.assertEqual(len(test_map), 256)
self.assertRaises(ValueError, lambda: palette.getcolor((1, 2, 3)))
def test_file(self):
palette = ImagePalette("RGB", list(range(256))*3)
f = self.tempfile("temp.lut")
palette.save(f)
from PIL.ImagePalette import load, raw
p = load(f)
# load returns raw palette information
self.assertEqual(len(p[0]), 768)
self.assertEqual(p[1], "RGB")
p = raw(p[1], p[0])
self.assertIsInstance(p, ImagePalette)
self.assertEqual(p.palette, palette.tobytes())
def test_make_linear_lut(self):
# Arrange
from PIL.ImagePalette import make_linear_lut
black = 0
white = 255
# Act
lut = make_linear_lut(black, white)
# Assert
self.assertIsInstance(lut, list)
self.assertEqual(len(lut), 256)
# Check values
for i in range(0, len(lut)):
self.assertEqual(lut[i], i)
def test_make_linear_lut_not_yet_implemented(self):
# Update after FIXME
# Arrange
from PIL.ImagePalette import make_linear_lut
black = 1
white = 255
# Act
self.assertRaises(
NotImplementedError,
lambda: make_linear_lut(black, white))
def test_make_gamma_lut(self):
# Arrange
from PIL.ImagePalette import make_gamma_lut
exp = 5
# Act
lut = make_gamma_lut(exp)
# Assert
self.assertIsInstance(lut, list)
self.assertEqual(len(lut), 256)
# Check a few values
self.assertEqual(lut[0], 0)
self.assertEqual(lut[63], 0)
self.assertEqual(lut[127], 8)
self.assertEqual(lut[191], 60)
self.assertEqual(lut[255], 255)
def test_rawmode_valueerrors(self):
# Arrange
from PIL.ImagePalette import raw
palette = raw("RGB", list(range(256))*3)
# Act / Assert
self.assertRaises(ValueError, palette.tobytes)
self.assertRaises(ValueError, lambda: palette.getcolor((1, 2, 3)))
f = self.tempfile("temp.lut")
self.assertRaises(ValueError, lambda: palette.save(f))
def test_getdata(self):
# Arrange
data_in = list(range(256))*3
palette = ImagePalette("RGB", data_in)
# Act
mode, data_out = palette.getdata()
# Assert
self.assertEqual(mode, "RGB;L")
def test_rawmode_getdata(self):
# Arrange
from PIL.ImagePalette import raw
data_in = list(range(256))*3
palette = raw("RGB", data_in)
# Act
rawmode, data_out = palette.getdata()
# Assert
self.assertEqual(rawmode, "RGB")
self.assertEqual(data_in, data_out)
def test_2bit_palette(self):
# issue #2258, 2 bit palettes are corrupted.
outfile = self.tempfile('temp.png')
rgb = b'\x00' * 2 + b'\x01' * 2 + b'\x02' * 2
img = Image.frombytes('P', (6, 1), rgb)
img.putpalette(b'\xFF\x00\x00\x00\xFF\x00\x00\x00\xFF') # RGB
img.save(outfile, format='PNG')
reloaded = Image.open(outfile)
self.assert_image_equal(img, reloaded)
if __name__ == '__main__':
unittest.main()