On Mon, Jun 14, 2010 at 11:06 AM, Fischer, Andreas <andreas.fisc...@kreis-unna.de> wrote: > Hi Frank, > thanks for your hints. I could finally use tiffinfo very easily from > FWTools-Shell, for I'm testing with a windows machine :-) ... > b) File transformed with gdalwarp (gdal-file) > > TIFFReadDirectory: Warning, Unknown field with tag 42113 (0xa481) encountered. > TIFF Directory at offset 0x10a8036 (17465398) > Image Width: 11812 Image Length: 11812 > Bits/Sample: 1 > Sample Format: unsigned integer > Compression Scheme: None > Photometric Interpretation: palette color (RGB from colormap) > Samples/Pixel: 1 > Rows/Strip: 5 > Planar Configuration: single image plane > Color Map: (present) > Tag 42113: 255 > > > c) gdal-file (b) opened with IrfanView and saved as a copy without changes > > TIFF Directory at offset 0x10a35bc (17446332) > Image Width: 11812 Image Length: 11812 > Resolution: 0, 0 pixels/inch > Bits/Sample: 1 > Compression Scheme: None > Photometric Interpretation: min-is-white > Orientation: row 0 top, col 0 lhs > Samples/Pixel: 1 > Rows/Strip: 5 > Planar Configuration: single image plane > Software: IrfanView
Andreas, The most obvious difference between these is that the GDAL generated file has a color table while IrfanView does not save one with it's 1 bit output file. It would appear that some software packages do not properly support paletted one bit files. Unfortunately, because GDAL "sees" the min-is-white input file as paletted it produces a paletted output file. I cannot think of an easy way of avoiding this. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
