Is that so? That stereograph is for parallel eyes view. Did you look at it focusing behind the screen? Anyway as replying to the question from Rob, I must again confess the perspective appearance among stars in my stereographs is not reliable since the blurry of star appeared on the image doesn't reflect the distance of that star from the telescope (If it were, we've had the distance of star from earth without the red-shift calibration!)

The attached stereographs are for NGC6543 (Cat's Eye Nebula / view: parallel/crossed eyes).

I think I know how it could be done. In a nebula the more distant features will be blurred by the dust in front of them. The software may interpret this as distance.

Harry:

Parallel = in front
Cross-eyed = behind

Whaddyaknow!

Bob Shaw

Okeydokey. I'll put the stereograph of V838 for another viewing method. Also please look at dilo's wonderful anaglyph for V838 shown in his earlier post.

That's right. However since the scattering of light is influenced by the thickness of dusts, the star in the thicker dusts will look further distant. That problem should be resolved for realizing more consistent perspective.

The attached stereograph is for M20. (view: parallel/crossed eyes)

I like IC4406 and Cat's Eye Nebula, it seems that this algorithm is tailored for nebulae rendering!

Thank you. In the case of Nebulae, Stereographer synthesizes the images for eyes as if the left eye is 1000 light years away from the right eye. The following image is the synthesized stereograph for the firework (view: parallel/crossed eyes). You can see the original picture here (gamma correction has been applied.) In this case the left eye was assumed around 50 m away from the right eye. But please mind we can see firework in perspective even though our left eye is not 50 m away from right eye. The software expresses the perspective keeping reality but with the different way from that our eyes employ.

This discussion has caught my attention. How could software take a flat image and create a steropair with apparent 3D properties? I don't know the answer, but the fireworks pair gives us the opportunity to view a scene containing other visual cues about the distance to objects that are more familiar to us. I played with the fireworks pair tonight, and I wonder if the program may be doing something as simple as shifting pixel locations according to their relative luminosity. While the sterograph did display apparent depth, some of the parts did not seem to be in the appropriate places.

It might be interesting to use this program to create other, earthly scenes that we could analyze.

Ok. I attached the stereograph synthesized by Stereographer for an earthly scene (view: parallel eyes.) My method evaluates the extent of blurry or complexity, not brightness nor luminosity for expressing perspective. However if the original picture has halation, the brightness would seem to give some effects on the expressed perspective.

For other "earthly" examples, please visit;

http://139.134.5.123/tiddler2/stereographe.../microscope.htm (microscopic images / view: parallel eyes)
http://www.geocities.com/q17320508/stereog.../xray2/xray.htm (X-ray images /view: crossed eyes)
http://www.geocities.com/q17320508/stereograph/misc/misc.htm (portraits / view: parallel eyes)

Stereoscopic M27 (view: parallel eyes) synthesized by Stereographer

Harry, I think this could be another great subject (bubble nebula):
http://antwrp.gsfc.nasa.gov/apod/image/051..._croman_big.jpg
But pls, again, can you post also bigger (possibly crossed eye) stereograms?
Thanks.

Thank you for your explanation, Harry. After reading all the previous posts in this discussion, I still didn't realize the application was shifting pixels according to blurriness. Now, I understand.

I enjoyed your nebulae examples. I think I'll download a copy and try it myself.

Oh, that's terrific picture! I've made the stereograph for it, but... I found Mr. R. Croman has the copyright of that picture. So I must ask his permission for releasing the stereograph based on his picture. If I got his permission, I'll let you know.

It's my pleasure that you've enjoyed those stereoscopic nebula images. The software includes Focus Corrector and Contourer other than Stereographer. Regarding the trial version of Stereographer, you must look at the synthesized stereograph with crossed eyes (or parallel eyes) when the focus on the original picture resides in the background (or foreground.) Within a few days, I'll update the latest version of Stereographer on which you can choose the method to synthesize stereograph for crossed eyes or parallel eyes regardless with the position of focus on the original picture.

The attached stereograph is for M17 (view: parallel/crossed eyes).

Ouch. That really would be quite a hangover.