Just a quick follow-up regarding PNG and reading embedded profiles with
PIL in general: I looked at PIL's PngImagePlugin.py and found that
support to read embedded ICC profiles was not there. So I added a method
to be able to retrieve the profile:
PngImagePlugin.py, line 35:
import zlib
PngImagePlugin.py, line 165:
class PngStream(ChunkStream)
...
def chunk_iCCP(self, pos, len):
# ICC profile
s = ImageFile._safe_read(self.fp, len)
# 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)
i = string.find(s, chr(0))
self.im_info["icc_profile"] = zlib.decompress(s[i+2:])
return s
Then, the profile data can be accessed via im.info["icc_profile"]
Here's the additions necessary to also have im.info["icc_profile"]
entries for JPEG and TIFF:
JpegImagePlugin.py, line 85 in def APP(self, marker):
...
elif marker == 0xFFE2 and s[:12] == "ICC_PROFILE\0": # ICC profile
self.info["icc_profile"] = s[14:]
...
TiffImagePlugin.py, line 105:
ICCPROFILE = 34675
TiffImagePlugin.py, line 519 in def _decoder(self, rawmode, layer):
...
if self.tag.has_key(ICCPROFILE):
self.info['icc_profile'] = self.tag[ICCPROFILE]
...
Regards,
Florian
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