I found this on an astronomy blog to which I subscribe. I assume it's a conversion done in Photoshop, but it's based upon scientific evidence that this is the way it might actually appear if viewed in stereo.
Duke
Here is the notation from the web:
Are you ready for more stereo vision? This haunting Hubble
Telescope image has been visualized for dimension by the one and only
Jukka Metsavainio and gives us a look at one of the most complex planetary nebulae ever photographed. Inside NGC 6543 - nicknamed the "Cat's Eye Nebula" - the Hubble has revealed delicate structures including concentric gas shells, jets of high-speed gas, and unusual shock-induced knots of gas? and thanks to Jukka's "magic vision" we're able to take a look into the Cat's Eye as it might appear in dimension. Step inside and let's learn more?
When Jukka produces an image, it's more than just a clever Photoshop "trick". Hours of study must go into each image, because the light is acting differently in each part of the nebula. To make these images work correctly, Jukka must understand which stars are causing the ionization, which stars are nearer and further from our point of perspective and so on. Each type of image is totally unique and what makes dimension work for a reflection nebula won't work for an emission nebula. Says Jukka; "To be able to make those stereo pairs, one have to learn lots of things about the targets, and beside that, study the actual image more deeply than usual. Star distances must be measured by the size and the color. For example, stars with yellowish hue must be in or behind the nebulosity, white/blue ones are front of it."