i love that moon in the resample well done!
to get to the command prompt, click on "ms dos prompt" or "command line" under prgrams -> accessories
or press start>run and them type cmd.
if your planet by itself image scale is not too big, ie more than 400 pixels, then a simple:
ppmcentre -outdir=out will cut to 400px high by 400 px wide
to get a pre-registax quailty sort happening, assuming all the bmp's has number on the end ir jup001, jup002 etc
ppmcentre -outdir=out -qestimator -renumber=last
etc
by the way, it can get messy with ppmcentre and moons that are not pretty close to the planet
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