How to indicate a touch on a touch screen

Subject: How to indicate a touch on a touch screen
From: Jan Axelson <jan -at- lvr -dot- com>
To: techwr-l -at- lists -dot- techwr-l -dot- com
Date: Fri, 23 Oct 2009 10:07:13 -0500

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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