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Hey bones, Although I haven't used the crossed eyes method, the method I use works great, but takes a bit of concentration. The crossed-eye method is good if the images are set up for crossed eye viewing. If not, the image depth is inverted, with objects that are supposed to be close look far and vice versa. I have had the ability to view stereo images without a viewer for many years. The technique is called "parallel free viewing".

First, look at the image, then imagine the image is a long distance away as you continue to stare. What happens is that the middle image will slowly appear and finally become 3D. Continue to stare way out, like the image is a quarter of a mile away, and the image will seem to snap in place.

What is happening is that your eye's lines of focus are oing almost parallel, instead of focussing inwards to form a triagle at a point at the image. Your right eye winds up focussed on the right image, and your left eye is now focussed on the left image. Your brain takes care of making the image into a 3D picture.