I've recently set up coppermine gallery, and all has worked fine, except for uploading of gif and bmp, actually only JPG pictures gets uploaded successfully...
When I try to upload a bmp pic, I get the message "Invalid GD extension", and that the file was not placed.
any way to fix this?
Short answer: that's expected behaviour.
Long answer: If you use GD as image library, you simply can not use bmp files (a similar thing applies to GIFs, depending on your version of GD - see http://forum.coppermine-gallery.net/index.php?topic=9407.0). Convert your bmp file on your client before you upload it - not by just renaming the extension (will lead you nowhere), but by actually using your favorite desktop app (e.g. MS Paint or IrfanView (http://www.irfanview.com/)) to open the file and use the "save as..." dialog to convert it to jpg or png. You can even batch-convert several BMPs at once (refer to the batch-converting tutorial (http://coppermine.sourceforge.net/tutorial/)). Even if GD would support BMPs, it's silly to have them on your web server: they are uncompressed and thus use up enormous amounts of space, and not every user (depending on OS and browser) will be able to see them.
Joachim