A Mac user contributed the attached scene source and description below.  
Please direct questions to the author, not me.

    Thorsten

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>To: mac### [at] povrayorg
>Subject: Astrophotography
>
> When processing images recorded through a telescope it is necessary
> sometimes to "stack" images to get a suitable final result.  There
> are two processes.  One is to combine three gray-scale images
> recorded through color filters (red, green, blue), with color
> restored, to get a final color image.  The other  process is to
> combine several (color or gray-scale) images to produce a final image
> in which the detail is better than in any one of the individual
> images.
>
> The process involves "stacking" the images so that the final image
> contains content from all the images.
>
> I searched internet astronomy sites for inexpensive "stacking"
> software that will run on a Macintosh and was unsuccessful (it may be
> out there but I couldn't find it).  In desperation I turned to
> POV-Ray and put together a program that will do the job.
>
> I don't know if anyone has tried this with POV-Ray so I'm sending you
> the source code in case it may be of value to someone.
>
> I think that the source code is self explanatory.  In the example
> attached, the code combines a red, a green and a blue image to
> produce a final full color image.  A slight modification will allow
> stacking multiple color or gray-scale images.
>
> Rick Smith
> --
> http://home.pe.net/~rmsmith



____________________________________________________
Thorsten Froehlich
e-mail: mac### [at] povrayorg

I am a member of the POV-Ray Team.
Visit POV-Ray on the web: http://mac.povray.org

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