2007.08.25 22:29 "[Tiff] 24-bit samples in TIFF", by Bob Friesenhahn

Due to statements in Chris Cox's draft specification, it seems that 24 bit values are now officially swapped to match the "host" endianness (a recent libtiff change). However, there is no "host" endianness for 24 bits for any known host on the planet since CPUs (other than perhaps some exotic DSP) do not have 24-bit words. I have not checked to see what libtiff is really doing, but it seems to me that it is best for the libtiff API user if 24-bits are presented in big-endian network-byte-order and not swapped into an order which does not help any type of host. If libtiff needs to swap data before it goes into the file in order to be complaint with Chris Cox's draft specification (and Photoshop CS2), then that is fine.

Opinions?

Bob
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Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/