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October 2005
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2005.10.28 04:21 "Re: How located pixels with BitsPerSample not bound to byte?", by Chris Cox
> > > The second problem involves this same section of code (1-32 bit sample... > > > > I'll stay out of this issue, though I suspect that 24bit data should not > > be byte swapped. > > The latest libtiff does byte-swap 24-bit data because Chris Cox at > Adobe claims that this is what the TIFF specification implies and > because it is necessary to read/write the new 24-bit floating format > from Adobe Photoshop CS2. I must admit to being dubious about this > claim, and I believe that Joris is as well. But if Adobe Photoshop > CS2 does it, by-golly it must be right! 24 bit RGB is usually a misnomer for 8 bits/channel * 3 channels, and doesn't get any byte swapping. But a single 24 bit value (integer or float, aka 24 bit/channel) needs to be byte swapped - as does any single value that has bits/channel equal to a multiple of 8. (if (bitsPerSample % 8 == 0) then byteswap) Chris