Tim Attwood wrote:
>still, I understand that the commercial set up goes for about $20k, if
>you have any
>idea of where to look for free software from astronomical places....
>
>So far I've managed to straighten one of my test images, but it still
>seems a bit off
>of true...

Astronomical software may be of minimal use for this, because in a lot of
optical astronomy the field of view is usually small enough that you can
relate one image to another by a linear transform (no perspective
problems). However, if your images can be related to each other with simple
shifts, shears and rotations, astronomical packages may be of some use.
Unless you really, really have to do this, or just want to play about with
similar concepts in POV, I'd avoid attempting to use the full-blown astro
software. These packages are not really orientated to anything but
astronomical images and the procedures are time-consuming and still
undergoing refinement to an extent. Having said that, you may want to look
at the dither tools in STSDAS/IRAF (http://iraf.noao.edu and
http://stsdas.stsci.edu) or the CCDPACK component from STARLINK
(http://www.starlink.rl.ac.uk). These tools will not work on anything but
properly headed astronomical images, so the documentation might be of more
use than the packages themselves.

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