2012.06.06 13:42 "Re: [Tiff] Custom and EXIF directory read/write", by Bob Friesenhahn
A common expectation/requirement is to be able to take an EXIF chunk from JPEG and put it in TIFF, or vice-versa. The method you describe seems to require that the application/user add tags one by one so it is necessary to parse the EXIF blob fully in order to transfer it into TIFF. Is there a possibility of extracting an EXIF "blob" from TIFF or inserting an EXIF "blob" into TIFF? This would require fixup of the IFD offsets since the offsets are treated differently in JPEG and TIFF.
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/