A few anaglyph thoughts...

[P3D Shelley, Dan <dshelley@xxxxxxxx>]

>It does NOT produce a "color" anaglyph -- 
>it converts both images to grey scale first, 
>and THEN makes the anaglyph, which is often 
>more satisfactory than the "color" anaglyphs 
>anyway, IMHO.

Agreed that a gray anaglyph is most often better than a color anaglyph. 
However, the recent discussions, and this note made me think of a few 
things taht anyone making anaglyphs should keep in mind.

1. Aligning the left and right images from your stereo pair when 
composing your anaglyph is extremely important. There are few things 
that bother me more than anaglyphs with horrible vertical misalignment. 
It just causes the viewer to work too hard to "get" the 3D information. 
When creating anaglyphs, take great care to make sure the vertical and 
horizontal alignment is correct. (Vertical to ease the fusing to the 
two images and horizontal to guarantee the appropriate "window" of the 
final product.

2. Several free and shareware packages that I have found and tried 
create anaglyphs by putting a gray version of one of the pair images in 
the Blue channel of an image, and a gray version of the other image in 
the Red channel of the anaglyph. The final image from this process is 
decidedly "purple" looking. My number one pet peeve!! To rectify this 
situation, simple split the RGB parts of your image, copy the Blue 
image and paste it over the Green section. Now you have identical image 
in the Blue and Green channels. When recombined the anaglyph will look 
like a gray anaglyph.

Just a few random thoughts... Hope they help someone,

Dan Shelley
dshelley@xxxxxxxx


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