Image cutouts in Keynote

[KenDRhyD]

I have come across some interesting Keynote files that contain some slides that I really like. One uses what is called a 'cutout' on top of an image/photo, but it is not part of the master slide, and I am not certain how to recreate a similar effect on my own.

The slide is a standard slide with a header text box only. Then there is an image, which is actually a screen capture of a dialog box from an application. On top of this is a 'cutout', which appears to be another image file, the same size as the slide (or larger) that has some transparency applied, and a rectangular region within the center of the slide so that a selected area of the dialog is clear and the remainder is greyed-over, simulating a highlighting of that area of the dialog.

I can copy and paste these two images, but the 'cutout' just appears to be a large black rectangle with a smaller rectangle drwn within it. I have used Canvas and Graphic Converter to attempt to examine it, but cannot determine exactly what it is or how to manipulate this one or create a new one fram scratch.

I like the effect and would like to use it myself, but do not understand how.

I do NOT use PhotoShop, and likely never will -- too expensive and I do not do enough graphics to justify the price or the size of the package on my system.