Since his arrival at the Red Planet, Mars Exploration Rovers, Spirit and Opportunity have returned a number of postcards in 3-D for countless fans equipped with red and blue glasses. For some, the realistic images of the rocky Martian terrain may seem magical, but the concept behind the illusion is actually quite simple."Basically, the 3-D images fool your brain into doing what he always does in the real world,"says Zareh Gorjian, a graphic Laboratory at NASA's Jet Propulsion, which makes 3-D images and animations Mars to live, both on the type in black and white and in color the more advanced versions.
So simple is the trick that with a little effort, everyone with a camera, a computer equipped with a photo editor, and a pair of tinted glasses can make their own 3-D images of Mars , family members, pets or anything else before a development lens.
Gorjian, who played with the technique for 10 years, transforms all kinds of images in 3-D feasts for the eyes, including his latest vacation photos. "It's just fun, " he said.
The key to the 3-D imaging lies in simulating a left eye and right. For the Mars Exploration Rovers, this is accomplished with the help of an eye of the camera left and right. Images of lenses rovers' stereo camera (or cameras risk avoidance, navigation cameras or panoramic cameras) are colored in red and blue, then merged into one blurred picture, which appears off the page when is viewed through a pair of red - and blue glasses.
"Your brain thinks it is seeing two separate images left and right and so does what she always does - combines them into one image," said Gorjian.
These photos basic 3-D are called anaglyphs and work best when viewed in black and white. Color anaglyphs are more difficult because objects appear red and blue only one eye. "You give up color when you use the red and blue glasses, " says Gorjian.
Instead, he and his colleagues at the JPL Multimission Image Processing Laboratory create 3-D color photos using two sophisticated techniques: polarization and infrared transmission. In polarization, the light from images left and right eye is polarized, or made travel in the opposition, the perpendicular directions. In the infrared transmission, the images left eye and right flickered back on a special screen faster than the eye can blink. Both strategies require specialized glasses for viewing.
3D glasses are enjoying a renaissance at the moment but the new ones are a distant echo of the red-blue affairs of youth. Old-fashioned 2-color 3D images are called anaglyphs, and still have a very nostalgic appeal for many people. This video shows you how to make stereoscopic anaglyph using Photoshop, allowing you to create all sorts of cool pictures that old 3D glasses to use.
Learn How to make stereoscopic 3D pictures with Photoshop. For more Photoshop How-To Videos & Articles, visit WonderHowTo.
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