[gdal-dev] gdal_calc.py and NoData issues

[Andreas Neumann]

Hi,

I have an issue with gdal_calc.py and nodata values.

My input data contains a lot of white pixels. After running gdal_calc.py 
with the following parameters

gdal_calc.py -A test.tif --outfile=testcalc.tif 
--calc="(A==249)*255+(A<>249)*A"

it turns out that all pixel values with 255 are now nodata values ;-( Is 
there an option so that my 255 values are not turned into nodata? I 
tested with the --NoDataValue option (e.g. 99 - which I don't use in the 
image), but it seems to be ignored. For me it is important that black 
and white pixels are preserved.

Thanks for any hints,
Andreas