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Moved iCCP chunk before PLTE chunk when saving as PNG

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This commit is contained in:
Andrew Murray 2017-01-15 17:36:59 +11:00
parent da8f2737a8
commit 361f579579
2 changed files with 31 additions and 12 deletions
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24
PIL/PngImagePlugin.py
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@ -715,6 +715,18 @@ def _save(im, fp, filename, chunk=putchunk, check=0):
b'\0', # 11: filter category
b'\0') # 12: interlace flag
icc = im.encoderinfo.get("icc_profile", im.info.get("icc_profile"))
if icc:
# ICC profile
# according to PNG spec, the iCCP chunk contains:
# Profile name 1-79 bytes (character string)
# Null separator 1 byte (null character)
# Compression method 1 byte (0)
# Compressed profile n bytes (zlib with deflate compression)
name = b"ICC Profile"
data = name + b"\0\0" + zlib.compress(icc)
chunk(fp, b"iCCP", data)
if im.mode == "P":
palette_byte_number = (2 ** bits) * 3
palette_bytes = im.im.getpalette("RGB")[:palette_byte_number]
@ -764,18 +776,6 @@ def _save(im, fp, filename, chunk=putchunk, check=0):
for cid, data in info.chunks:
chunk(fp, cid, data)
icc = im.encoderinfo.get("icc_profile", im.info.get("icc_profile"))
if icc:
# ICC profile
# according to PNG spec, the iCCP chunk contains:
# Profile name 1-79 bytes (character string)
# Null separator 1 byte (null character)
# Compression method 1 byte (0)
# Compressed profile n bytes (zlib with deflate compression)
name = b"ICC Profile"
data = name + b"\0\0" + zlib.compress(icc)
chunk(fp, b"iCCP", data)
ImageFile._save(im, _idat(fp, chunk),
[("zip", (0, 0)+im.size, 0, rawmode)])

19
Tests/test_file_png.py
View File

@ -497,6 +497,25 @@ class TestFilePng(PillowTestCase):
self.assertEqual(repr_png.format, 'PNG')
self.assert_image_equal(im, repr_png)
def test_chunk_order(self):
im = Image.open("Tests/images/icc_profile.png")
test_file = self.tempfile("temp.png")
im.convert("P").save(test_file)
chunks = []
fp = open(test_file, "rb")
fp.read(8)
png = PngImagePlugin.PngStream(fp)
while True:
cid, pos, length = png.read()
chunks.append(cid)
try:
s = png.call(cid, pos, length)
except EOFError:
break
png.crc(cid, s)
self.assertLess(chunks.index(b"iCCP"), chunks.index(b"PLTE"))
if __name__ == '__main__':
unittest.main()