free tool for setting .png dpi?

[Robert Lauriston <robert -at- lauriston -dot- com>]

Anybody know a free tool for setting the dpi (pHYs) atribute in .png files?

Flare will use the setting if it's set when generating PDFs, but
doesn't have a setting for it. I know Flare has other settings for
controlling image size in printed output, I need to set the dpi
attribute.

SnagIt works, but it's not free.

If PhotoScape lets you set the dpi attribute, I can't find it.
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