I have taken a screenshot of a dialog in Windows and I want to manipulate it so that one of the controls on the dialog is highlighted. One effect that I have seen other screenshots take is to darken most of the screenshot, leaving the control to which the viewer's attention should be drawn in its original color. The image at http://blog.tomayac.de/images/Google_REST_Describe_request_test.png is close to the effect I want to achieve -- darken some areas of the screenshot and leave other areas in their original color, thereby bringing attention to the undarkened areas.
How might I acheive this effect in Paint.NET? I am new to the app, so feel free to point me to tutorials if I need to learn about layers or some other aspects of the app.
Thank you!
