Mikael, > 1. If an RGB Tiff file doesn't have PhotometricInterpretation = RGB, can it > really be claimed that the file adheres to the Tiff standard, or is it > corrupt?
If it has 2 values for ExtraSamples, then I believe is technically legal (the TIFF spec is not really clear but libtiff interprets PhotometricInterpretation = MinIsBlack as meaning one nominal channel, all the other ones being extra samples), but of course, readers are not expected to interpret such 3-channel files as being RGB. > 2. If the min and max intensities are not the same as the min and max > representable numbers for the integer type, then how are they specified in > Tiff? There are MinSampleValue and MaxSampleValue tags in the TIFF spec, but those are not really used by GDAL and are just reported as metadata. $ cp byte.tif test.tif $ tiffset -s MinSampleValue 1 0 test.tif $ tiffset -s MaxSampleValue 1 255 test.tif $ gdalinfo test.tif [...] Metadata: AREA_OR_POINT=Area TIFFTAG_MAXSAMPLEVALUE=255 TIFFTAG_MINSAMPLEVALUE=0 Even -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/gdal-dev
