Quote Originally Posted by Big Frank View Post
All I do is create a rectangle corresponding to the size of image I want to export and set it to the back. Then, with it still selected, I click export.
You can in fact skip the 'set it to the back' step entirely. If the rectangle has no fill but has a line then (while still selected) exporting will only export the area 'covered' by the rectangle, rather like a cropping tool.