Re: Color-filtered anaglyph

[P3D Marvin Jones <72657.3276@xxxxxxxxxxxxxx>]

> A large black object with no clear edges will look flat in any kind
> of stereo photography.  But if there are distinguishable objects in front or
> behind it, then their mutual alignments will look different to your
> left and right lenses.

It's quite true that you need some kind of "modelling" to get a 3D effect, but
that's not what I had in mind. Think of it this way--the way anaglyph works, at
least in its "normal" B&W incarnation, is to use a red filter to "mask out" the
red portions of the image and "darken in" the blue ones. Conversely, the blue
lens filters out the blue image and darkens the red one. If you photograph a
scene through red and blue filters, the effect of the filter is to color the
light part of the image (where light passes through the filter and picks up its
color). Dark objects are not affected by the filter. Therefore, your picture
will have images which tend to be red-and-black and blue-and-black (whereas a
true anaglyph print would be white-and-red and white-and-blue). Viewed through
anaglyph glasses, the black areas will not be filtered by EITHER lens--both eyes
will see both images without any filtration taking place. The color will effect
lighter portions of the image, which is why, with a great deal of imagination,
you can see 3D in a picture shot this way, minimal as it is. This is why
photographing through colored lenses can not produce a viable anaglyph image.


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