Pillow/Tests/test_file_jpeg2k.py
2014-03-27 08:36:15 +00:00

111 lines
3.1 KiB
Python

from tester import *
from PIL import Image
from PIL import ImageFile
codecs = dir(Image.core)
if "jpeg2k_encoder" not in codecs or "jpeg2k_decoder" not in codecs:
skip('JPEG 2000 support not available')
# OpenJPEG 2.0.0 outputs this debugging message sometimes; we should
# ignore it---it doesn't represent a test failure.
ignore('Not enough memory to handle tile data')
test_card = Image.open('Tests/images/test-card.png')
test_card.load()
def roundtrip(im, **options):
out = BytesIO()
im.save(out, "JPEG2000", **options)
bytes = out.tell()
out.seek(0)
im = Image.open(out)
im.bytes = bytes # for testing only
im.load()
return im
# ----------------------------------------------------------------------
def test_sanity():
# Internal version number
assert_match(Image.core.jp2klib_version, '\d+\.\d+\.\d+$')
im = Image.open('Tests/images/test-card-lossless.jp2')
im.load()
assert_equal(im.mode, 'RGB')
assert_equal(im.size, (640, 480))
assert_equal(im.format, 'JPEG2000')
# ----------------------------------------------------------------------
# These two test pre-written JPEG 2000 files that were not written with
# PIL (they were made using Adobe Photoshop)
def test_lossless():
im = Image.open('Tests/images/test-card-lossless.jp2')
im.load()
im.save('/tmp/test-card.png')
assert_image_similar(im, test_card, 1.0e-3)
def test_lossy_tiled():
im = Image.open('Tests/images/test-card-lossy-tiled.jp2')
im.load()
assert_image_similar(im, test_card, 2.0)
# ----------------------------------------------------------------------
def test_lossless_rt():
im = roundtrip(test_card)
assert_image_equal(im, test_card)
def test_lossy_rt():
im = roundtrip(test_card, quality_layers=[20])
assert_image_similar(im, test_card, 2.0)
def test_tiled_rt():
im = roundtrip(test_card, tile_size=(128, 128))
assert_image_equal(im, test_card)
def test_tiled_offset_rt():
im = roundtrip(test_card, tile_size=(128, 128), tile_offset=(0, 0),
offset=(32, 32))
assert_image_equal(im, test_card)
def test_irreversible_rt():
im = roundtrip(test_card, irreversible=True, quality_layers=[20])
assert_image_similar(im, test_card, 2.0)
def test_prog_qual_rt():
im = roundtrip(test_card, quality_layers=[60, 40, 20], progression='LRCP')
assert_image_similar(im, test_card, 2.0)
def test_prog_res_rt():
im = roundtrip(test_card, num_resolutions=8, progression='RLCP')
assert_image_equal(im, test_card)
# ----------------------------------------------------------------------
def test_reduce():
im = Image.open('Tests/images/test-card-lossless.jp2')
im.reduce = 2
im.load()
assert_equal(im.size, (160, 120))
def test_layers():
out = BytesIO()
test_card.save(out, 'JPEG2000', quality_layers=[100, 50, 10],
progression='LRCP')
out.seek(0)
im = Image.open(out)
im.layers = 1
im.load()
assert_image_similar(im, test_card, 13)
out.seek(0)
im = Image.open(out)
im.layers = 3
im.load()
assert_image_similar(im, test_card, 0.4)