Pillow/Tests/test_image.py
2016-11-14 21:12:25 +11:00

266 lines
7.6 KiB
Python

from helper import unittest, PillowTestCase, hopper
from PIL import Image
import os
import sys
class TestImage(PillowTestCase):
def test_sanity(self):
im = Image.new("L", (100, 100))
self.assertEqual(
repr(im)[:45], "<PIL.Image.Image image mode=L size=100x100 at")
self.assertEqual(im.mode, "L")
self.assertEqual(im.size, (100, 100))
im = Image.new("RGB", (100, 100))
self.assertEqual(
repr(im)[:45], "<PIL.Image.Image image mode=RGB size=100x100 ")
self.assertEqual(im.mode, "RGB")
self.assertEqual(im.size, (100, 100))
Image.new("L", (100, 100), None)
im2 = Image.new("L", (100, 100), 0)
im3 = Image.new("L", (100, 100), "black")
self.assertEqual(im2.getcolors(), [(10000, 0)])
self.assertEqual(im3.getcolors(), [(10000, 0)])
self.assertRaises(ValueError, lambda: Image.new("X", (100, 100)))
# self.assertRaises(
# MemoryError, lambda: Image.new("L", (1000000, 1000000)))
def test_width_height(self):
im = Image.new("RGB", (1, 2))
self.assertEqual(im.width, 1)
self.assertEqual(im.height, 2)
im.size = (3, 4)
self.assertEqual(im.width, 3)
self.assertEqual(im.height, 4)
def test_invalid_image(self):
if str is bytes:
import StringIO
im = StringIO.StringIO('')
else:
import io
im = io.BytesIO(b'')
self.assertRaises(IOError, lambda: Image.open(im))
@unittest.skipIf(sys.version_info < (3, 4),
"pathlib only available in Python 3.4 or later")
def test_pathlib(self):
from pathlib import Path
im = Image.open(Path("Tests/images/hopper.jpg"))
self.assertEqual(im.mode, "RGB")
self.assertEqual(im.size, (128, 128))
temp_file = self.tempfile("temp.jpg")
if os.path.exists(temp_file):
os.remove(temp_file)
im.save(Path(temp_file))
def test_tempfile(self):
# see #1460, pathlib support breaks tempfile.TemporaryFile on py27
# Will error out on save on 3.0.0
import tempfile
im = hopper()
fp = tempfile.TemporaryFile()
im.save(fp, 'JPEG')
fp.seek(0)
reloaded = Image.open(fp)
self.assert_image_similar(im, reloaded, 20)
def test_internals(self):
im = Image.new("L", (100, 100))
im.readonly = 1
im._copy()
self.assertFalse(im.readonly)
im.readonly = 1
im.paste(0, (0, 0, 100, 100))
self.assertFalse(im.readonly)
test_file = self.tempfile("temp.ppm")
im._dump(test_file)
def test_comparison_with_other_type(self):
# Arrange
item = Image.new('RGB', (25, 25), '#000')
num = 12
# Act/Assert
# Shouldn't cause AttributeError (#774)
self.assertFalse(item is None)
self.assertFalse(item == None)
self.assertFalse(item == num)
def test_expand_x(self):
# Arrange
im = hopper()
orig_size = im.size
xmargin = 5
# Act
im = im._expand(xmargin)
# Assert
self.assertEqual(im.size[0], orig_size[0] + 2*xmargin)
self.assertEqual(im.size[1], orig_size[1] + 2*xmargin)
def test_expand_xy(self):
# Arrange
im = hopper()
orig_size = im.size
xmargin = 5
ymargin = 3
# Act
im = im._expand(xmargin, ymargin)
# Assert
self.assertEqual(im.size[0], orig_size[0] + 2*xmargin)
self.assertEqual(im.size[1], orig_size[1] + 2*ymargin)
def test_getbands(self):
# Arrange
im = hopper()
# Act
bands = im.getbands()
# Assert
self.assertEqual(bands, ('R', 'G', 'B'))
def test_getbbox(self):
# Arrange
im = hopper()
# Act
bbox = im.getbbox()
# Assert
self.assertEqual(bbox, (0, 0, 128, 128))
def test_ne(self):
# Arrange
im1 = Image.new('RGB', (25, 25), 'black')
im2 = Image.new('RGB', (25, 25), 'white')
# Act / Assert
self.assertTrue(im1 != im2)
def test_alpha_composite(self):
# http://stackoverflow.com/questions/3374878
# Arrange
from PIL import ImageDraw
expected_colors = sorted([
(1122, (128, 127, 0, 255)),
(1089, (0, 255, 0, 255)),
(3300, (255, 0, 0, 255)),
(1156, (170, 85, 0, 192)),
(1122, (0, 255, 0, 128)),
(1122, (255, 0, 0, 128)),
(1089, (0, 255, 0, 0))])
dst = Image.new('RGBA', size=(100, 100), color=(0, 255, 0, 255))
draw = ImageDraw.Draw(dst)
draw.rectangle((0, 33, 100, 66), fill=(0, 255, 0, 128))
draw.rectangle((0, 67, 100, 100), fill=(0, 255, 0, 0))
src = Image.new('RGBA', size=(100, 100), color=(255, 0, 0, 255))
draw = ImageDraw.Draw(src)
draw.rectangle((33, 0, 66, 100), fill=(255, 0, 0, 128))
draw.rectangle((67, 0, 100, 100), fill=(255, 0, 0, 0))
# Act
img = Image.alpha_composite(dst, src)
# Assert
img_colors = sorted(img.getcolors())
self.assertEqual(img_colors, expected_colors)
def test_effect_mandelbrot(self):
# Arrange
size = (512, 512)
extent = (-3, -2.5, 2, 2.5)
quality = 100
# Act
im = Image.effect_mandelbrot(size, extent, quality)
# Assert
self.assertEqual(im.size, (512, 512))
im2 = Image.open('Tests/images/effect_mandelbrot.png')
self.assert_image_equal(im, im2)
def test_effect_mandelbrot_bad_arguments(self):
# Arrange
size = (512, 512)
# Get coordinates the wrong way round:
extent = (+3, +2.5, -2, -2.5)
# Quality < 2:
quality = 1
# Act/Assert
self.assertRaises(
ValueError,
lambda: Image.effect_mandelbrot(size, extent, quality))
def test_effect_noise(self):
# Arrange
size = (100, 100)
sigma = 128
# Act
im = Image.effect_noise(size, sigma)
# Assert
self.assertEqual(im.size, (100, 100))
self.assertEqual(im.mode, "L")
self.assertNotEqual(im.getpixel((0, 0)), im.getpixel((0, 1)))
def test_effect_spread(self):
# Arrange
im = hopper()
distance = 10
# Act
im2 = im.effect_spread(distance)
# Assert
self.assertEqual(im.size, (128, 128))
im3 = Image.open('Tests/images/effect_spread.png')
self.assert_image_similar(im2, im3, 110)
def test_check_size(self):
# Checking that the _check_size function throws value errors when we want it to.
with self.assertRaises(ValueError):
Image.new('RGB', 0) # not a tuple
with self.assertRaises(ValueError):
Image.new('RGB', (0,)) # Tuple too short
with self.assertRaises(ValueError):
Image.new('RGB', (0,0)) # w,h <= 0
self.assertTrue(Image.new('RGB', (1,1)))
# Should pass lists too
i = Image.new('RGB', [1,1])
self.assertIsInstance(i.size, tuple)
def test_storage_neg(self):
# Storage.c accepted negative values for xsize, ysize. Was
# test_neg_ppm, but the core function for that has been
# removed Calling directly into core to test the error in
# Storage.c, rather than the size check above
with self.assertRaises(ValueError):
Image.core.fill('RGB', (2,-2), (0,0,0))
if __name__ == '__main__':
unittest.main()