"Chris Taylor" wrote in message
...
Apologies for posting the second link twice, this was an afterthought.

The unprocessed image prior to digital enhancement.
http://homepage.ntlworld.com/taylor_.../M31unproc.jpg

The processed image
http://homepage.ntlworld.com/taylor_...31_resize2.jpg

Hope this demonstrates the rationale behind the application of digital
filters. I still hope to improve on these techniques someday. Its a
lengthy
learning curve.

Regards


Chris



Chris,

I noticed you had about 30 odd minutes of expsoure (74 x 30s) on your image!
How come so many smaller ones instead of one bigger one? Again, i realise
that filters have their place and obviously in this case have improved
detail no end. I have (somewhere at home) a 15 minute ISO 400 film
exposure(200mm FL) of M31 that i took on a crystal clear night(similar to
last night after rain that shows similar detail to your modified image. I
will dig it out and scan it and publish a link to it over the weekend.

We have seemed to miss the main point of my post! The question i pose is
basicly how much proccesing is too much. The differences between your M31
pre and post proccessing are clear, at that point i would say thats far
enough, the image looks far better than the original and indeed, far better
than any of us will see with our 1/60 eyes!

R