As far as I remember BMP files are not supported in Aperture. Actually surprised to hear that you can do anything with a file of that format in Aperture.
From the specification page:
Native RAW import and editing of images from leading digital cameras and camera backs
(See RAW support page for model listing.)
- .ARW, .CR2, .CRW, .MOS, .NEF, .RAF, .RAW, .SRW, .TIF, .OLY, .FFF, .3FR, .DNG1
Compatible with all major still image formats
- JPEG, GIF, TIFF, PNG, PDF, PSD2
Notice no BMP.
I believe you might be able to convert it to JPG in Preview. If not do a web search.
Frank, your answer is quite correct of course!
Aperture doesn't allow for editing of BMP files. But it does allow storing them. Just like it will store movie files, but not edit them.
And Preview does provide the ability to Export a BMP as a JPG. Which can then be imported into Aperture and edited!
Problem solved!! THANKS!!!