How to indicate a touch on a touch screen

[Jan Axelson <jan -at- lvr -dot- com>]

I'm working on the design of a touch screen that will show several 
images (photos), about 1 in. x 1 in. each. Touching an image 
initiates an action on the device. It's not a commercial product but 
an example to demonstrate touch-screen programming.

Any recommendations for how to indicate visually that a device has 
detected a touch? For example, I could briefly fade the image or 
change the color or width of the image's border. (I don't want to use 
raised/depressed button images.)

Suggestions or references to sources welcome.

Jan (long-time lurker and very occasional poster)

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