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August 2007
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2007.08.07 14:02 "Re: Problem loading a RGB floating point TIFF", by Frank Warmerdam
Mircea Ciocan wrote: > Hello, > > I'm trying to load some high-dynamic images, both gray scale and RGB, > they are expressed as 32bits floats, the gray scale image ( 1 > sample/pix ) loads OK but I have an RGB image that could not be > loaded, here are the main tags of those two images: > > This image does NOT work: > ImageWidth (1 Short): 637 > ImageLength (1 Short): 502 > BitsPerSample (3 Short): 32, 32, 32 > Compression (1 Short): Uncompressed > Photometric (1 Short): RGB > StripOffsets (1 Long): 8 > SamplesPerPixel (1 Short): 3 > RowsPerStrip (1 Short): 502 > StripByteCounts (1 Long): 3837288 > PlanarConfig (1 Short): Contig > SampleFormat (3 Short): 3, 3, 3 > > This image works: > ImageWidth (1 Short): 1024 > ImageLength (1 Short): 6144 > BitsPerSample (1 Short): 32 > Compression (1 Short): Uncompressed > Photometric (1 Short): MinIsBlack > StripOffsets (6 Long): 8, 4194312, 8388616, 12582920, 16777224,... > SamplesPerPixel (1 Short): 1 > RowsPerStrip (1 Short): 1024 > StripByteCounts (6 Long): 4194304, 4194304, 4194304, 4194304, 4194304,... > PlanarConfig (1 Short): Contig > SampleFormat (1 Short): 3 > > The library version is TIFFLIB_VERSION 20060323 and the error code is > unsupported format. It seem that this version does not support 3 > sample/pix floating point encoding and my question is that if there is > a later version that does support that format or if not if support for > this format is planned in the near future ? Mircea, Are you using the TIFFReadRGBAImage() interface? At the risk of being defensive, reporting that TIFFReadRGBAImage() does not support a particular image configuration is *not* the same as saying libtiff does not support it. TIFFReadRGBAImage() is a convenience function to normalize a wide variety of input images into easy to use form, but was never expected to support all files that libtiff supports. 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