Fischer, Andreas wrote:
Dear list,
I try to convert a raster images (GTiff) with gdalwarp. The images only
have two colors (black/white) and the color table just have two entries.
Therefore the file size for each image is exactly as big as needed
(1bit/pixel). The result of gdalwarps transformation are images with
8bits / pixel and 256 entries in the color table. The file size for each
image is increased but in this case this is without benefit, because
the results are still black and white.
So I tried the creation option “-co NBITS=1”. Color Table und file size
are now exactly as I expected, but I can’t display the result properly
with any program. For example IrfanView does fine, but unfortunately
MapInfo Professional doesn’t. MapInfo Professional just shows irregular
stripes. After opening the result file in IrfanView and saving it as a
copy, the copy is displayed in MapInfo fine as well. I do not understand
this behavior, because gdalinfo doesn’t show any differences.
Andreas,
It would be helpful if you could provide a tiffinfo report for each of
the three files. It should reveal more of the low level tiff format
details which will be needed.
Best regards,
--
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