Crossing the eyes (or, as is done in an actual stereo viewer, focusing past two images to make them merge) is done for traditional black-and-white or color prints/slides displayed side by side so the two images become one. The red/green viewing is for when the two images are superimposed so that, when you're wearing the appropriate red/green glasses, one eye sees one image and the other eye sees a different image ... I guess what I'm getting at is that it's superfluous to cross your eyes to superimpose a red/green stereo pair. The red/green viewing is specifically for when the images are already superimposed on the page, not when you're asking your brain and eyes to do the superimposing.
Joe
I have examined Red/Green stereo pairs and Red Green 'Land Experiment Pairs' and from the incredibly bizarre effects I can conclude only one thing. That the mechanism of seeing in humans is not only complicated, but is highly subjective (if one can use such a term). Its quite impossible to describe all the strange and startling visual effects I've been seeing over the past hour or two. But I still can't properly merge layers or even make them correctly. I've been merging Red/Green 'Land' pairs by ~treating them as stereo pairs~ and crossing my eyes, my left eye covered with a red filter the right with green. The result is a dull slightly yellow red image no blue at all. But the (mine anyway) brain seems to be able to flip between monochrome, red and green at random. I have not so far seen anything to compare with the images projected in my first Land experiments at UCT long ago.Super-imposing a Red/Green stereo pair by crossing the eyes gives very strange colour effects (it varies over time - seconds). The stereo in this case is good as would be expected. Adding the filters (red left, green right) changes the whole thing to monochrome to start with but the colours keep changing and it seems one can do this by concentrating on one eye or the other. The results are startling. If anyone has time to give me blow by blow instructions for handling layers to do this test I'd be happy to go on - when my head stops spinning. Don Don Williams ___________ Dr E D F Williams http://personal.inet.fi/cool/don.williams Author's Web Site and Photo Gallery Updated: March 30, 2002
