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60 lines
1.8 KiB
Python
60 lines
1.8 KiB
Python
from tester import *
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from PIL import Image
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try:
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import _webp
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except:
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skip('webp support not installed')
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def test_read():
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""" Can we write a webp without error. Does it have the bits we expect?"""
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file = "Images/lena.webp"
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im = Image.open(file)
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assert_equal(im.mode, "RGB")
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assert_equal(im.size, (128, 128))
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assert_equal(im.format, "WEBP")
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assert_no_exception(lambda: im.load())
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assert_no_exception(lambda: im.getdata())
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orig_bytes = im.tobytes()
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# generated with: dwebp -ppm ../../Images/lena.webp -o lena_webp_bits.ppm
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target = Image.open('Tests/images/lena_webp_bits.ppm')
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assert_image_equal(im, target)
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def test_write():
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""" Can we write a webp without error. Does it have the bits we expect?"""
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file = tempfile("temp.webp")
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lena("RGB").save(file)
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im= Image.open(file)
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im.load()
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assert_equal(im.mode, "RGB")
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assert_equal(im.size, (128, 128))
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assert_equal(im.format, "WEBP")
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assert_no_exception(lambda: im.load())
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assert_no_exception(lambda: im.getdata())
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# If we're using the exact same version of webp, this test should pass.
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# but it doesn't if the webp is generated on Ubuntu and tested on Fedora.
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# generated with: dwebp -ppm temp.webp -o lena_webp_write.ppm
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#target = Image.open('Tests/images/lena_webp_write.ppm')
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#assert_image_equal(im, target)
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# This test asserts that the images are similar. If the average pixel difference
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# between the two images is less than the epsilon value, then we're going to
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# accept that it's a reasonable lossy version of the image. The included lena images
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# for webp are showing ~16 on Ubuntu, the jpegs are showing ~18.
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target = lena('RGB')
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assert_image_similar(im, target, 20.0)
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