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January 2008
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2008.01.10 22:08 "Re: LibTiff..Reading partial strips", by Frank Warmerdam
Nikhil Shirahatti wrote: > I havent tried it..but the cautionary note that " It is not always > possible to do so due to decompression constraints" scares me. I also > read on the archive that "that *strip* * chopping* only works for > uncompressed IFDs.". How common(or uncommon) is this? When would one > use compressed IFD's? > The tiff's we get can be compressed or uncompressed formats and we have > to support them all. :) Nikhil, I think Bob means compressed images. There is no such thing as compressed IFDs. Compressed TIFF images are quite a common case, and fax compressed images are often one strip. In addition to "strip chopping", libtiff also has the TIFFReadScanline() function for reading strips one scanline at a time. This operates without needing to read and decompress the whole strip at once. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | President OSGeo, http://osgeo.org