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In Photoshop (5.5) I make a new RGB, say 100 x 100 px, 300 dpi (in inches .333 x .333).
With a few lines it ends up at 30k.
Save as a .png
Open the .png again in Photoshop, check image size...
100 x 100 px, 72 dpi.
Still 30k mind you, and the new size is relative to the 'new' resolution - 1.389 x 1.389 inches - so I can change it back to 300 dpi without loss, but the resolution reported has changed.
Any idea why?
However, there are a number of PNG plug-ins available for it (mostly commercial last I looked), so if you're really interested in doing a lot of PNG output through photoshop, that might be the way to go.