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test_file_ppm.py
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test_file_ppm.py
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import pytest
from PIL import Image, UnidentifiedImageError
from .helper import assert_image_equal, assert_image_similar, hopper
# sample ppm stream
TEST_FILE = "Tests/images/hopper.ppm"
def test_sanity():
with Image.open(TEST_FILE) as im:
im.load()
assert im.mode == "RGB"
assert im.size == (128, 128)
assert im.format, "PPM"
assert im.get_format_mimetype() == "image/x-portable-pixmap"
def test_16bit_pgm():
with Image.open("Tests/images/16_bit_binary.pgm") as im:
im.load()
assert im.mode == "I"
assert im.size == (20, 100)
assert 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(tmp_path):
with Image.open("Tests/images/16_bit_binary.pgm") as im:
im.load()
f = str(tmp_path / "temp.pgm")
im.save(f, "PPM")
with Image.open(f) as reloaded:
assert_image_equal(im, reloaded)
def test_pnm(tmp_path):
with Image.open("Tests/images/hopper.pnm") as im:
assert_image_similar(im, hopper(), 0.0001)
f = str(tmp_path / "temp.pnm")
im.save(f)
with Image.open(f) as reloaded:
assert_image_equal(im, reloaded)
def test_header_with_comments(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P6 #comment\n#comment\r12#comment\r8\n128 #comment\n255\n")
with Image.open(path) as im:
assert im.size == (128, 128)
def test_nondecimal_header(tmp_path):
path = str(tmp_path / "temp.djvurle")
with open(path, "wb") as f:
f.write(b"P6\n128\x00")
with pytest.raises(UnidentifiedImageError):
Image.open(path)
def test_truncated_file(tmp_path):
path = str(tmp_path / "temp.pgm")
with open(path, "w") as f:
f.write("P6")
with pytest.raises(UnidentifiedImageError):
Image.open(path)
def test_neg_ppm():
# 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 pytest.raises(UnidentifiedImageError):
Image.open("Tests/images/negative_size.ppm")
def test_mimetypes(tmp_path):
path = str(tmp_path / "temp.pgm")
with open(path, "w") as f:
f.write("P4\n128 128\n255")
with Image.open(path) as im:
assert 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:
assert im.get_format_mimetype() == "image/x-portable-anymap"