The header contains: Byte Introducer = 0x21 MathML text is embedded into a GIF file as an Application Extension Record, which consists of a 14-byte header (Application Extension Descriptor), followed by the MTEF data. From the MathType SDK (free download link below): (This however doesn't appear to be the junk character you're seeing.) The reason for the 255's is that the MathML is distributed over multiple comment records, each one of which starts with a count of the bytes in the record. In that one, if you just grab all the bytes from the first bit that looks like MathML until the end, you do periodically get odd bytes in there, mostly 255's except the last one. Only one of your GIFs had MathML - the one that has a file name starting 106R. It could be you extracting the data incorrectly (we haven't looked at your script yet). Perl script that extracts MathML from GIF image generated by MathType: The original GIF file which doesn't contain MathML text: There is a garbled character in the seventh line of MathML text: " ?#x00A0 ". I have tried to paste full block of MathML here, but I found the syntax format of MathML text was messed. Is this MathType 's BUG? How can I work around this problem? I have uploaded my test GIF files. In the above line, a garbled character is inserted before 'mn' label. However, when I extracted MathML text from these GIF files using Perl script, I found some garbled characters in the MathML text as following text: As a result, MathML text is inserted into the end of GIF files. Firstly, I opened these GIF files and saved them within MathType 6.7. I want to convert MathType equation saved as GIF format to MathML.
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