Re: [photo-3d] Digest Number 344

[Ray Zone <r3dzone@xxxxxxxxxxxxx>]

Gabriel wrote:

> Glasses are important and they are certainly not
> all created equal. Some are fine tuned for CRT's
> and some for printing. Not all glasses made for
> printing will work well on all printed matter
> since the inks are optimized (hopefully!) for a
> particular pair of glasses (maybe Ray Zone can
> shed some light on this partcularly colorful
> (not comic) issue!). The SI glasses are very
> good. One of the worst glasses unfortunately
> (billed as being one of the best), are the
> Proview anaglyph glasses.

Ray Zone responds:

CRT's use Additive filtration and printing uses
Subtractive filtration.  RED will ghost and be
tough to cancel on a CRT.  BLUE will ghost and
be tough to cancel with printing.

So for CRTs the RED lens needs to be dense.
For printing the BLUE lens needs to be dense.

Absorption/transmission characteristics of the
SI glasses are optimum for printed polychromatic anaglyph.

The tradeoff:  the denser the lens the darker
the image.  Also:  blue and red lenses should
ideally have relatively equal transmission
characteristics so that each eye sees similar
gray scale contrast values.

The trick, of course, is to make it work
whether you're using two-color monochromatic
anaglyphs or full-color polychromatic anaglyphs
on a computer or a printed page.
(Note:  Thank you, everybody, for spelling
anaglyph correctly!)

Gabriel-I have hard plastic lens anaglyph glasses
available for $10 postpaid - red lens-left eye.
Optimum for CRTs but work very well with printing.
Also available for same price in a clip-on style.

----- 

"It is difficult to break through the wall of usual seeing and begin to
discover how many other things there are to see.  It requires practice and
special information--you have to know what you're looking for--and it also
requires energy, since it involves special concentration."
    --from "The Object Stares Back" by James Elkins (Simon & Schuster: 1996)

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