Julien Michielsen wrote:

Some time ago I was pointed to Registax, a windows program that runs well under wine. With Registax one stacks (stax ;-) a series of almost identical images which are composed with a webcam. As far as I under- stood the images must be overlapped perfectly. I think this can be done with photoshop. Could Gimp achieve this as well?

Hugin can certainly help you align frames perfectly prior to any other processing with the GIMP.

http://hugin.sf.net/

If you want to get really serious about astrophotography, you might also check out IRAF which I used when I was doing this stuff using large telescopes (4m reflector).

http://iraf.noao.edu/

Warning: IRAF is not for the faint of heart - the learning curve is almost vertical! Read the tutorials.

Cheers, Toby Haynes

On Mon, 2007-04-23 at 22:10 +0200, Julien Michielsen wrote:

On Sunday, April 22, 2007 10:30 pm, Tommy Lim wrote:

Hi,

I am looking for tutorials that teach me how to use Gimp for astronomy
photos processing?

Any idea?

From Astroblog

http://astroblogger.blogspot.com/2006/03/yet-another-venus-animation.html

"Coming soon, Ian's guide to using The Gimp for astrophotography."

--- Some time ago I was pointed to Registax, a windows program that runs well under wine. With Registax one stacks (stax ;-) a series of almost identical images which are composed with a webcam. As far as I under- stood the images must be overlapped perfectly. I think this can be done with photoshop. Could Gimp achieve this as well?

I tried Registax with wine some time ago without much success. Things might have improved since then so I must try again. Meanwhile there is an application called AstroStack, freely available on the Web, which does what you need for stacking multiple photos. Also, the usual tools such as contrast, brightness, sharpness etc are readily available and not difficult to use in Gimp.

Norman

< snip >

I tried Registax with wine some time ago without much success. Things might have improved since then so I must try again. Meanwhile there is an application called AstroStack, freely available on the Web, which does what you need for stacking multiple photos. Also, the usual tools such as contrast, brightness, sharpness etc are readily available and not difficult to use in Gimp.

I came across this which you may find interesting.

http://www.threebuttes.com/RegistaxTutorial.htm

Norman