Reply to thread

Thanks, I've got it now! I wasn't clicking on the actual thumbnail in the rectangle's layer, I should have known this. To avoid adding more and more layers, I've actually copied and pasted direct to the new (final) image.

The only thing I'm a little unhappy about is the straightening process. Is there a way to somehow snap and/or auto- straighten a skewed marching-ant selection? Manually positioning the ruler seems rather imprecise, and anyway I haven't worked out how to do this without rotating the whole image?