Is there a maximum limit to the amount of metadata that can be incorporated in an individual field of TIFF file metadata? I'd like to store a large text (up to a few MB) in the ImageDescription field.
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There's no specific maximum limit to the ImageDescription field, however, there's a maximum file size for the entire TIFF file. This maximum size is 4 GB. From the TIFF 6.0 spec:
The largest possible TIFF file is 2**32 bytes in length.
This is due to the offsets in the file structure, stored as unsigned 32 bit integers.
Thus, the theoretical maximum size is that which @cgohlke points out in the comments ("2^32 minus the offset"), but most likely you want to keep it smaller, if you also intend to include pixel data...
Storing "a few MB" should not be a problem.
Harald K
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