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May 2005

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2005.05.27 03:03 "Support for NewSubFileType by various TIFF Specifications", by Bob Young

I’m in the process of adding thumbnail images to TIFF files of our digital
camera firmware. Due to the fact that some of the TIFF module’s functions
are shared by other objects such as EXIF and DNG, and the fact that I can’t
guarantee I’ll be decoding files that I’ve written, I need to support four
different TIFF related specifications: TIFF/EXIF (ver 2.2), TIFF6.0,
TIFF/EP, and DNG.

I need to sort out the thumbnail, if any, location, (IFD0, IFD1, or a SubIFD
of IFD0) when decoding a file conforming to any one of the four specs. My
question is, in any TIFF file conforming to one of those four, can I rely on
each IFD and/or SubIFD containing either a NewSubFileType or a SubFileType
tag?

Thanks,
Bob Young
Byoung@NucoreTech.Com