ppm to png and back with least loss

jzqrt <[email protected]>
Newsgroups gmane.comp.video.image-magick.user
Message-ID <[email protected]>
Greetings,
recently I've ran into a problem: I need to convert ppm (p3) to [insert
image format supported by browsers] and back so that those 2 ppm's would be
identical. So far I've found "convert in.ppm -compress none some.png &&
convert some.png -compress none out.ppm" to output least different ppm, but
I need even more precision. Could anyone tell me how to achieve this?
Format, size of the image that ppm will be converted to doesn't matter as
long as browsers support it.
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