T3D Re: e-microscope pairs

[aifxtony@xxxxxxx (Tony Alderson)]

from digest 489:
>John,
>Thanks for your sending the message, but I'm afraid I was unclear: I
>already have digital image files, one for each of the images (left and
>right) in black and white. I want to make a red/blue anaglyph image using
>a digital imaging processing program, Adobe Photoshop 5.0 for Macintosh is
>what we have and what I'm most familiar with. I specifically wonder if
>anyone has a protocol for using Photoshop to create anaglyph electronic
>stereo images. I would like to present several images in a presentation
>next week; I will use a digital projector and have a set of red/blue
>glasses.


Ah! You want to know HOW to make anaglyphs in Photoshop from grayscale
images! Easy!  (The process for color images is about the same.)

1.  Start with both images in Grayscale mode (not indexed, etc.)

2.  Convert the RIGHT image to RGB mode

                   Image > Mode > Grayscale

3.  Copy the LEFT image to the RED channel of the RIGHT (now RGB) image.

     a) Activate the LEFT image (single channel grayscale)
     b) Select ALL  (CMD-A on the Mac; CTRL-A on PC)
     c) Copy to the clipboard  (CMD-C)
     d) Activate the RED Channel of the RIGHT image (click on the bar)
     e) Select all
     f) Paste the clipboard into the channel (CMD-V)
     g) drop the selection

4.  Turn on visibility for the RGB channels (CMD-~).  Enjoy thrilling 3D

5.  If necessary, one can shift the RED channel for better convergence, or
to fix any vertical misalignment. This will probably require cropping to
get rid of the bands on the side and set the window.

Note: This is for RED LEFT viewers. If your glasses are RED RIGHT, you have
to do this the other way around.  This should pipe out to a RGB projector
just fine. But beware using a NTSC-TV projector; the anaglyph will be
seriously affected by the lousy colorspace.

It is also possible to overlay text labels, etc., even in stereo, by using
variations of the above, combined with the layering of Photoshop, but I'll
leave the details to you.

Tony






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