Re: PHOTO-3D digest 2113

[P3D Ray Zone <r3dzone@xxxxxxxxxxxx>]

>But aren't you assuming that the background on additive viewing is
>black?  If it were white, I think the situation becomes simular to your
>"subtractive", in that the left eye with the red filter will percieve
>blue as black against a red background and the right will perceve red as
>black against a blue background!

I believe John is correct.  Ray, you can check this for yourself on
your own web page!  Hold your red/blue specs up to the monitor using
the image at the top of your page (3dz.jpg) and notice which color
image disappears into the (white) background.  In particular, the blue
"rays" are invisible through the blue filter, and appear black throught
the red one.  Red most definitely does NOT see red; even though this is
a "computer" image, it is still subtractive from the white background.

(I've never seen an anaglyph on a black background, but then, there
are lots of things I've never seen...)

        -Greg W.

Greg (and John),

This issue is deceptive.  Things aren't what they appear. The image encoded
RED on the computer (with software such as Photoshop) appears to the naked
eye on the computer monitor as BLUE (or Blue/Green).  The image encoded
BLUE/GREEN appears to be RED.  This is precisely the reverse of Subtractive
Filtration.  It's confusing but the RED information on the computer appears
to be BLUE/GREEN precisely because Additive Filtration is at work (as
opposed to Subtractive Filtration where the pigment primaries appear to the
eye as they are).  Now, are you totally confused?

Ray 'Chroma' Zone


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