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August 2007
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2007.08.22 12:19 "Re: How to handle big single-strip images?", by Toby Thain
On 22-Aug-07, at 6:36 AM, jcupitt@gmail.com wrote: > On 8/22/07, Oliver Geisen <oliver.geisen@kreisbote.de> wrote: >> i wonder what will happen if one opens an tiff image where all the >> data is in a SINGLE strip (some writers offer this option) and also >> compressed (G4) and someone tries to use TIFFReadScanline with it? >> I would expect that libtiff needs to read the whole strip, because >> it's compressed, into memory. Or is it possible to read compressed >> data by chunks? > > This is what the tiled mode is for. Strip TIFFs (as you say) are not > very suitable for random access. Wouldn't that only depend on the strip size? --Toby > Tiled TIFFs work well with random > access, even with compression. > > We use JPEG-compressed tiled TIFF pyramids in our web image viewer and > performance is good. There's a demo with a 80,000 by 40,000 pixel > image here: > > http://iipimage.sourceforge.net/demo.shtml > > John > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/