Re: 3D-LCD Software??

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Tue, 7 Jan 97 10:47 CET
>From: P3D  Joerg Meyer Inf.]  writes:
>
>On Mon, 06 Jan 1997 Christian Taeuber <taeuber@xxxxxxxxxxxxxxxx> wrote:
>
>> Can someone tell me where to get 3D-LCD-creating Software?
>> I mean software that simply makes an interlaced 3D GIF-File out of one
>> left and one rigth picture file, and then for use with LCD-shutter
>> glasses.  
>
>There's a simple 1-2-3 method for everyone to do this in PhotoShop
>(or any other image processing software):
>
>1. Create an image with horizontal black and white lines
>   (use the 'fill pattern' function) of the same size
>   as the final image.
>
>2. 'Multiply' this image with your left frame and save it.
>   'Invert' the pattern frame, 'multiply' it with your
>   right frame and save it.
>
>3. 'Add' the two files which have been saved.
>
>Done! The resulting image contains the lines with even numbers
>from the left image and those with odd numbers from the right image.
>
>Hope this helps!


HOLD YOUR HORSES! 

This method definitely works, but leaves gaps of information if you use
alternate lines of each image. Remember the paired information is ideally
exactly horizontal. To make it truly viewable with half the information
missing, you have to NOT invert the line image. Use the exact same lines
from each pair, and before combining them, shift one of them either one
pixel up or down. This provides the most accurate and corresponding
information in the interlaced results.

The process is indeed easy in most graphics software. I use a process of
combining the lines with each image by arithmetically combining as *darker*.
Then when you combine the two halves, combine them as *lighter*. Programs
like PSP that don't have essential working tools like selection area
manipulations, require that you jump through a few strange hoops to
accomplish the shifting of one image by one pixel. Other programs that have
that capability are easiest to use and you simply tell it to shift one pixel
in the direction desired.

One other step that's important is getting the parallax right. Using the
process described here it is imperative to first adjust the images size and
position relative to each other so that a direct combination gives you what
you want. With this method, I find it easy to use a conversion to anaglyph
before making the interlaced versions, just to get it right. Make the
adjustments and crop to your final images before applying the lines.

I will be putting up a web page describing this process in PSP and other
software too, but Dave Harvey's new software makes it much easier. He
responded to this request earlier and has written to the group in the past
about his new software. It's worth trying!

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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