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pnmtopng / pngtopnm utilities. Independantly Alexander Lehmann and I
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(Willem van Schaik) started such a project. Luckily we discovered this
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and merged the two together into pnmtopng.tar.gz, which is available
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These two utilities have many, many options and make use of most of the
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features of PNG, like gamma, alpha, sbit, text-chunks, etc. This makes