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February 2006
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2006.02.02 15:36 "Re: Fastest method to load tiff files?", by Frank Warmerdam
On 2/2/06, Edward Lam wrote: > > What is the fastest way to read tiff files using libtiff? Edward, I would guess to use the TIFFReadEncodedStrip() or TIFFReadEncodedTile() functions, and to ensure you go from first to last strip/tile in order. I don't think you will gain much speed over that by special techniques. You might want to recognise some special cases, like packed stripped uncompressed 8bit data and just do a direct read or memory map of the data, but I doubt it will help much. You might also want to look at using the memory mapping support which sometimes can be faster than "normal" file IO. 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 | Geospatial Programmer for Rent