[gdal-dev] Does gdal_calc.py not calculate arithmetic with in the same file?

[Cleo Drakos]

Hi GDAL Developers,

I have one GeoTIFF file with 2 bands. The data type is Byte. I want to
calculate (Band2-Band1)/(Band2+Band1).

But the following command provided a dark image:

gdal_calc.py -A infile --A_band 1 -B infile, --B_band 0 --outfile outfile
--calc "(A-B)/(A+B)"

Does gdal_calc.py not calculate arithmetic with in the same file?

Thanks for your time.

cleo
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