Pillow/Tests/test_file_ppm.py

76 lines
2.5 KiB
Python

from PIL import Image
from .helper import PillowTestCase, assert_image_equal, assert_image_similar, hopper
# sample ppm stream
test_file = "Tests/images/hopper.ppm"
class TestFilePpm(PillowTestCase):
def test_sanity(self):
with Image.open(test_file) as im:
im.load()
self.assertEqual(im.mode, "RGB")
self.assertEqual(im.size, (128, 128))
self.assertEqual(im.format, "PPM")
self.assertEqual(im.get_format_mimetype(), "image/x-portable-pixmap")
def test_16bit_pgm(self):
with Image.open("Tests/images/16_bit_binary.pgm") as im:
im.load()
self.assertEqual(im.mode, "I")
self.assertEqual(im.size, (20, 100))
self.assertEqual(im.get_format_mimetype(), "image/x-portable-graymap")
with Image.open("Tests/images/16_bit_binary_pgm.png") as tgt:
assert_image_equal(im, tgt)
def test_16bit_pgm_write(self):
with Image.open("Tests/images/16_bit_binary.pgm") as im:
im.load()
f = self.tempfile("temp.pgm")
im.save(f, "PPM")
with Image.open(f) as reloaded:
assert_image_equal(im, reloaded)
def test_pnm(self):
with Image.open("Tests/images/hopper.pnm") as im:
assert_image_similar(im, hopper(), 0.0001)
f = self.tempfile("temp.pnm")
im.save(f)
with Image.open(f) as reloaded:
assert_image_equal(im, reloaded)
def test_truncated_file(self):
path = self.tempfile("temp.pgm")
with open(path, "w") as f:
f.write("P6")
self.assertRaises(ValueError, Image.open, path)
def test_neg_ppm(self):
# Storage.c accepted negative values for xsize, ysize. the
# internal open_ppm function didn't check for sanity but it
# has been removed. The default opener doesn't accept negative
# sizes.
with self.assertRaises(IOError):
Image.open("Tests/images/negative_size.ppm")
def test_mimetypes(self):
path = self.tempfile("temp.pgm")
with open(path, "w") as f:
f.write("P4\n128 128\n255")
with Image.open(path) as im:
self.assertEqual(im.get_format_mimetype(), "image/x-portable-bitmap")
with open(path, "w") as f:
f.write("PyCMYK\n128 128\n255")
with Image.open(path) as im:
self.assertEqual(im.get_format_mimetype(), "image/x-portable-anymap")