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August 2007
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2007.08.28 15:02 "Re: 24-bit samples in TIFF", by Bob Friesenhahn
On Tue, 28 Aug 2007, Frank Warmerdam wrote: > > I'm a bit confused on this topic, but I think I agree with Chris. I > think Bob's point is that since 24bit float isn't a native type it > isn't meaningful for libtiff to do any byte swapping on the data > as it is loaded to put it into local machine byte order since local > machine byte order doesn't really mean anything for a pseudo-datatype > like 24bit float. > > But my initial opinion is that I still expect libtiff to apply > byte swapping to local machine order. Libtiff did not used to do this so it represents an API-level interface change. It may be that until Adobe made 24 bits sound interesting, GraphicsMagick was the only application which cared about it. > What does libtiff do now with 24 bit integer values? Presumably we > should do the same thing with this and with the 24bit float values, > right? I'm afraid I don't know what that is, though with some help I am not sure what libtiff does. It depends on what version of libtiff is being used. And that is a problem. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/