Astroart Forum

Hello,

I have taken a series of 100 images of comet Lovejoy with STATIONARY camera.
As the optics cooled during the series, the images not only show shift and rotation but also a slow change of image scale.
Now i want to stack all these with AstroArt. How to do this?

How can i automatically equalize the image-scale for the series of images?
Rotation and Shift could then be done through the preprocessing menu and after that i could also stack while centering on the comet, but how to do the scaling?

Best regards,
Martin

Hello Martin,
the option "Star Pattern, align and rotate" is able to scale images, but it's limited to +- 2% to make it more robust and fast.
It seems that in your images you have a change of scale of 4/5 %.
Maybe you could solve this way:
In Preprocessing place as the first image the number #50 (of 100), then place the others. Doing so the scaling of every image may fall in the range +- 2%.

If this does not suffice, you may try to remove the first 10 and the last 10 images, or just write me for a personalized build without that limitation(!)
(yes of course a "Scale" parameter would have been better).

Hello,
Yes i think the software should learn that capability, which i have even found with some freeware tools (which also lack in convenience).
Regards, Mart