[photo-3d] Re: Anaglyphs on the computer/PowerPoint presentations

[Jim Crowell <jcrowell@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

> I tried red-green glasses and reg-cyan glasses, but the problem was
> the red color, not the green or cyan.  I haven't found glasses with a
> different red color.  They all seem to use the same 'red'.

The inexpensive anaglyph specs don't have particularly narrow-band filters.
I don't know if it's a problem with LCD displays, but with CRTs there's also
a problem because the red & green phosphor spectra overlap, so it's
impossible to eliminate crosstalk.  The best commercially-available anaglyph
specs that I've found are plastic-framed ones made for clinical testing.
Cost about $3 apiece (as near as I can remember) from Bernell Corp., who
oddly don't have a web site.  You can get a catalog from:

Bernell Corp.| 
750 Lincolnway E 
P.O. Box 4637 
South Bend, IN 46634
(219) 234-3200 
800-348-2225 
(219) 233-8422 Fax 

Last time I ordered I had to tell them that there would be a doctor present
when they were used (sheesh!).

For best results (cheaper, too), you could try replacing the filters in the
glasses you've got with bits of filter material from a theatrical supplies
store--the stuff they put in front of spotlights.  They may have a little
sample booklet with graphs of the transmission properties of the various
filters...

> ---> possibly the color in the anaglyphs could be manipulated to
> match 
> the red in the viewing glasses, but I haven't figured out how to do
> that in Paint Shop Pro 4.14.  any ideas?

Doing this might make things worse, if there is any spectral overlap in the
projector...

> (2) 
> In creating the anaglyph from stereo pairs, I just pasted L and R
> image exactly on top of each other.  Perhaps some shifting of the
> images would need to happen to create the correct stereo window, but:
> (a) I'm not sure if this is true ... any ideas?
> (b) I don't know how to shift one image using Paint Shop Pro 4.14
> (c) The resulting image would need to be further cropped to
> eliminate 
> the 'junk' around the edge of the non-overlapping images.

If you have Mac-access, you can use my Stereogler program
<http://vision-lab.psy.ohio-state.edu/crowell/software.html> to do this.
You adjust the window using the arrow keys & it takes care of the cropping
for you.

-Jim C.

-------------------------------------
Jim Crowell, Ph.D.
Dept. of Psychology
Cognitive/Experimental Group
Townshend Hall
1885 Neil Ave. Mall
Ohio State University
Columbus, OH 43210
mailto:crowell@xxxxxxxxxxxxxxxxx
mailto:crowell@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
mailto:crowell.20@xxxxxxx
http://vision-lab.psy.ohio-state.edu/crowell/