An Optical Illusion

When we do the gallery wrap on our canvas prints, I usually take just a tad along the edge of the image and digitally stretch it to several times its original width to wrap around the edge of the frame. When we do that stretching, we set up an optical illusion. When the image is hanging on the wall and you move to the side of the image, there will be some angle at which the stretched edge image will seem to be just a continuation of the image on the face of the frame. When I’ve discussed this with people in our booth at art festivals, I’ve left the calculation of that angle as an exercise for the listener.  Now I’ll describe the solution of that exercise in an article “Finding the Angle of the Illusion”.  This article is now on our website, but can’t yet be reached through the menu system. (I’ve recruited a friend to help me update the website, which is long overdue, so please bear with us).

Caution: this solution does involve basic trigonometry. Who would have thought we would ever use that stuff?

Author: Bruce

Although I grew up in Garden Grove, California, I have lived here in South Miami longer than I've lived anywhere else in the world. I've been married to my wonderful wife, Nancy, longer than I was ever without her. We were both teachers. Nancy recently retired after 40 years. I have also spent time as an officer in the Coast Guard, a commercial property appraiser, and an electrical engineering student. Now I'm technical support for Bee Happy Graphics. That means I handle this blog, our web page, and all E-mail, I do all post-processing and printing of the images, I cut mats and glass and frames. If you have a technical question, I would be the one trying to answer it.

Your "two cents worth" is welcome (but I don't give change).

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