Separate source for single image processing

[trimination]

So thumbCreate takes a path to a directory that should be filled with images, but what if just a single image needs rescaling?

It would be nice to run this program for just one image at a time. Ideally a separate source that uses essentially the same codebase, however if #1 is addressed then it would also be a viable solution to use command-line args to specify 1 image as opposed to a directory.