I have been using Aperture for a long time now, and am used to using repair and clone.
Today, I tried to clean up an area of a photo which is in BMP format, and clone does absolutely nothing.
Repair leaves a white path where I drag across the image. The white path disappears when I use repair again, and another white path appears.
Switching views (use "v"), brings me back to the image with absolutely no changes, and no white paths.
I have chosen radius = 11, softness = 0, and opacity is maxed at 1.
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.