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September 2007
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2007.09.26 01:52 "Re: TIFFClientOpen() fails for fiels with incorrect "ExtraSamples" field.", by Frank Warmerdam
On 9/25/07, Krishna Singh Karki <kskarki@hotmail.com> wrote: > > Hi All, > > I am using TIFF library version 3.8.2 and I am facing problem opening > certain scanned tiff files. > > I am using TIFFClientOpen() function to read tiff files. For a test tiff > file, I get a warning message > > incorrect count for field "ExtraSamples" (0, expecting 1); tag ignored. and > then the above call to TIFFClientOpen() returns NULL. > > I looked at tiff sources and the warning is thrown from CheckDirCount() > function in tif_dirread.c() function. Since the above message indicates a > warning on debugging I saw that it will always fail in above case. > > Is this a known issue? Is it due to the file being corrupt value for tag? Krishna, It sounds like libtiff reacts unnecessarily harshly to what I presume is an incorrectly setup TIFF file. If you can file a bug report on this with a moderately sized example file I hope we could do something about this. 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