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July 2008
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2008.07.09 19:35 "Re: Problems with non-symmetric tiled images", by Bob Friesenhahn
On Wed, 9 Jul 2008, David Hoerl wrote: > I plan to create tiff files on the Mac OSX using libtiff (which by the way > can be made into a universal 32/64 bit library quite easily). > > The tile width is 128 and the length (height) 48. I can create the files > using libtiff without error. They read in just fine in another program using > libtiff. Also, Photoshop on the mac displays them just fine. > > However, when I use any Apple's programs (Preview, Safari, etc) the images is > all jumbled up (symmetric tiles look fine), so I entered a bug on their > system. That said, I probably won't hear anything on this for ages. What version of libtiff are you using? Different versions of libtiff have different bugs. Some bugs are dependent on endian-order with big-endian bugs being more common than little-endian due to the system developers used, and because little-endian hides certain types of bugs. I recommend using libtiff tiff-3.9.0beta rather than 3.8.2 or older. > The, it occurred to me - it could be a problem with libtiff, and maybe > Photoshop uses libtiff, so it could be that Apple's reader was properly > designed. [Thinking that the use of non-symmetric tiles is probably not very > common.] You are correct that there are lots of readers which do not handle tiles. Perhaps this includes Apple's readers. Libtiff strives to implement the specification correctly and does as good a job as any other software. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/