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2009.10.28 16:22 "Re: Number of images in a multi-tiff file?", by Frank Warmerdam
Brad Hards wrote: > On Wednesday 28 October 2009 20:01:21 Mark Pereira wrote: >> Is there a way to know the number of images present in a multi-tiff file >> in constant time. > TIFFNumberOfDirectories() ? Mark, No, there is not since the directory list needs to be walked to count them. The count is not available in a header or anything like that. Skimming the code briefly it appears that TIFFNumberOfDirectories() is careful to read the minimum amount of information from the file (a few numbers from the start of each directory) to count through the file so the cost should be minimal, but not constant time. 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