>> You can't just rename pnm files. They are a specific type of graphics
>> format. If you have the netpbm package installed, there is a converter
>> to various other file formats. Since it's command line, a shell script
>> to loop through them all isn't too hard to write.
>> BTW, my gqview saves the thumbnails as png's. Also gimp will read pnm
>> files just fine. No need to rename, which is just confusing gimp.
> I guess you would confuse GIMP if you *don't* rename them. They are
> saved in PNM format but with the name of the original! So if you have
> foo.jpg and foo.gif GIMP writes two thumbnails into the preview
> directory but leaves the names unchanged.
> Marc 'BlackJack' Rintsch
When gqview saves the thumbnail, it saves it as me.jpg.png (at least my
version does; I checked before posting). The original poster was talking
about chaning the png (or pnm in his case) extension to something else
without actually converting the file. *That* would confuse gimp, or any
other program that tries to determine file type by extension.