#3 command line option -> output graphics in ppm format

[Anonymous]

Please allow for the outputtting of graphics extracted
from a .nes file into a png or equivalent format.

This format is just a text file of numbers giving each
individual pixel's color.

ppm - portable pix map
pgm - portable grey map
pbm - portable bit map

Ultimately, I would use nes tools like this:

nestook -extract_graphics_ppm outfile.ppm
convert.exe outfile.ppm outfile.jpg
show outfile.jpg

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note that this would use the ImageMagick convert.exe to
convert from ppm format to jpeg.

[spike grobstein]

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I'm working on that now... seems easy enough.

Expect pgm output.