Stereo just means "Two". In music, stereo is having two different audio channels recorded apart from one another. With our ears, having stereo hearing lets you identify the direction a sound is coming from. If you only had one working ear, this wouldn't work. With vision, having two eyes makes depth perception as each eye is a bit offset from the other. When the brain combines the two, the differences are perceived as distance. You can easily make the same effect with a photo, you take one picture, move the camera horizontally a few inches, then take another. When you lay them next to each other, and then cross your eyes so they each combine in the center, it reproduces stereo vision and creates the depth effect our eyes do. If you have a digital camera and photoshop, its really easy to make the anaglyph images that require the color glasses. Here is a neat tutorial on that : http://www.scec.org/geowall/makeanaglyph.html Whats going on here is you are using the glasses to assign one image to one eye, even though they are over layed on each other. The image you shot for your right eye is set to Red, and the image you shot for the left eye is set to Blue. The glasses are then set the same way so your right eye only sees the red image, and your left eye only sees the blue image. This is the same thing as crossing your eyes so the two images overlap, but it saves you the crossing the eyes part. This can be reproduced artificially with astrohpotgraphy. An astrophoto is duplicated, then you can manipulate one photo to create an offset where you think it should be in the other photo. It's totally artificial, but does create a 3d depth effect. The only true way to get the effect with stereo vision or photography was mentioned before, you need angular separation of the two images up to a certain amount. This is why you cant really make a stereo photo of deep space objects, they are just to far away. You would need to send two spacecraft out from earth in opposite directions equipped with the same cameras, and have them take shots of the same object ect to get it to work. They actually have done this with the sun. They have two different satellites out in orbit that image the sun from wide enough apart to give a stereo view of it. http://www.nasa.gov/mission_pages/stereo/news/stereo3D_press.html Cheers, David On 9/23/2010 12:34 PM, Julie Clyde wrote:
Stupid question.. what is this stereo effect you're all talking about?
On Thu, Sep 23, 2010 at 12:30 PM, Daniel Holmes<danielh@holmesonics.com>wrote:
Hadn't thought of that Rodger. I just chalked it up to the fact that I have no depth perception...
Dan
On Sep 23, 2010, at 12:22 PM, Rodger C. Fry wrote:
With the moon being 240,000 miles away and Maui only about 5,000 from
Utah,
this makes the angular view about .02 degrees. This is not enough to
expect
to see stereo effect. Thanks Rodger Fry
-----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Kim Sent: Thursday, September 23, 2010 11:44 AM To: 'Utah Astronomy' Subject: Re: [Utah-astronomy] Do you see stereo?
I tried, but sorry, I couldn't see a stereoscopic effect.
Kim
-----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of
Patrick
Wiggins Sent: Thursday, September 23, 2010 4:01 AM To: utah astronomy utah astronomy listserve Subject: [Utah-astronomy] Do you see stereo?
Rob on Maui and me here in Utah got some shots of the Moon tonight. Both
of
us were using C-5s operating at 1,250mm f/10.
He has one of those pesky j-o-bs to go to in the morning so he wasn't
able
to stay up long enough to process and send me his first rate stuff (hopefully he'll be able to do that later today) but he did send one of
his
test images earlier in the night.
When I put one of my shots next to his test shot I think I'm seeing
stereo.
But maybe not.
Here's the image: http://users.wirelessbeehive.com/~paw/temp/stereo01.jpg
Anyone else seeing any signs of stereo?
Mine (on the left) was taken at 0900 UTC while his test shot was taken
about
0630.
The ones he's sending later today were taken at the same time as mine.
Thanks,
patrick _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
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-- Daniel Holmes, danielh@holmesonics.com "Laugh while you can, monkey boy!" -- Lord John Whorfin
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