Waylaid by RMagick Woe

My Rails app adventures have ground to halt finally. The app itself is still viable, though filled with code that needs refactoring for sure. But the image processing is screwed for now. At least on OS X. I’m going to have to move on to other aspects of the app for now.
Simply resizing images in RMagick results in stuff like this far too often to be reliable for now.

It’s not drastic in this example, but it’s not acceptable either, the grey at the bottom shouldn’t be there at all. It’s not in the original image. Resizing an image to a smaller size certainly shouldn’t introduce this stuff.

Any help is welcome…