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December 2004
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2004.12.09 12:48 "Re: Q: writing tiled TIFFs", by Chris Losinger
At 05:12 AM 12/9/2004, you wrote: > > if i have a tile size of 256x256 and a 200x200 image, how should i > > fill the tile buffer before calling TIFFWriteTile? LibTiff doesn't give me > > any errors when i go to write it, so i assume it's a legal tile size. but, > > the image pixels are messed up (looks like row length is wrong somewhere). > > Are you properly padding stuff, so as to end up with 256 lines of 256 pixels? If > not, you ought to. yes. i'm copying squares out of my source image into a 256x256 buffer (doing what amounts to an image overlay of the source onto the tile buffer - so the tile buffer maintains its 256x256 nature and the overlayed image only covers a part of the tile buffer). then i pass that to TIFFWriteTile. > However, I wouldn't write such a TIFF as tiled, even though you can. If you > consider 256x256 good tile sizes, 256x256 is apparently the LibTiff default. why does LibTiff choose that for a 200x200 image ? i don't know. i'm just trying to figure out tile writing in general. ---- Chris Losinger losinger@earthlink.net smallest@smalleranimals.com http://www.smalleranimals.com