Joe, Of course its superfluous to cross the eyes when viewing red green stereo pairs provided they have been superimposed - but they haven't. I know quite a bit about this having been doing it for so many years I don't like to think about it. I'm experimenting and its really surprising what the brain can do with these images. I had not intention of making red green stereos. I was making red and green pictures for the Land experiment and while I was at it added some normal stereo pairs and red green ones to finish the film. I've posted some stereo pairs on my website if you want to look at them:
http://personal.inet.fi/cool/don.williams/hold/pairs/pairs.htm The real problem is making them big enough. Viewing with a stereoscope (like the one in the picture) helps since it has built-in 3X (I think) magnification. I just about to print them (B&W) to see what they look like through the stereoscope. I can't find a tutorial that deals with layers in Photoshop. I'm waiting for a knowledgeable member to help. 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 ----- Original Message ----- From: "Joe Wilensky" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, January 08, 2003 5:11 PM Subject: Re: Experiments > I can't help with the Photoshop questions, but as far as the > red/green stereo pairs, you may be giving yourself unneeded headaches. > > 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 > > >
