2) See
PMView screenshot (195k)
or
PMView screenshot (520k)
Notice the resolution reported by the main window "Transform->Resolution" dialogue is 600dpi,

but the resolution reported by the FOC's RMB->Info dialogue is 300dpi.

The FOC is reporting on a newly-created (File->SaveAs opertaion) copy.
Steps to recreate:
* Create a 600dpi image in PNG format. I used a scanner for this.
* Use PMV FOC to convert it to PNM format. I did it the "long" way, by using FOC to load to main window, then File->SaveAs and changed the "Save As Type".
It's possible that we've had this discussion before . . . perhaps the PNM format does not store the dpi info? If so, PMV should not report to the user an assumed value -- "Not available" would be more appropriate for display purposes, even if PMV uses 300dpi internally.
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BTW, whose brilliant idea is it to limit inline images to the Unisys GIF format? This is what I saw when I tried to post PNGs:

Regards,
Al S.