Like I mentioned last time, it is a lot of trouble to highlight a small region of a screen capture image, like this:
_(It would be substantially easier if you give up the fuzzy edges around the highlighted region, but you still need to 1. Add a new layer, 2. Paint it black,
- Make it semi-opaque, 4. Select a rectangle and cut it out.)_
So I decided to make a small app that performs all this image processing (overlay a semitransparent dimming layer, and cut a hole in it with blurred edges) with just one mouse drag.
The basic functionality is already working, but I still have some polishing (testing) to do. Stay tuned!