Correcting for Field Rotation - software to do it?

rogerg (Roger) · #1 28-03-2006, 12:55 AM

Hi everyone,

Does anyone know of software that will take a series of shots (20 say) and rotate each such that field rotation is removed?

It's straight forward to do in photoshop, but is a tediouse task for even a small number of shots like 20, taking ages to do (5+ mins each) and becomes less accurate for shots that have less field rotation (less easy to eyeball the difference).

It'd be nice if Registax or similar could auto-rotate the images. Rotation is not necessarily about the centre, so the software would have to find the centre of rotation.

Ideas? suggestions?

Thanks,
Roger.

iceman (Mike) · #2 28-03-2006, 05:44 AM

I would've thought "registar" could do it? It's a brilliant piece of software that can align and stack any number of odd shaped widefield images.

The trial version doesn't let you save, but it should give you an idea of whether it can do it.

xstream (John) · #3 28-03-2006, 08:39 AM

I believe that's what Meade's 'drizzle' software does.

[1ponders] (Paul) · #4 28-03-2006, 10:19 AM

You can do it in Registax, but the result isn't always "predictable" I've had some stunning visual effects turn out though. You can also do a rotate in ImagesPlus as well.

rogerg (Roger) · #5 28-03-2006, 10:56 AM

Interesting - how can I do it in Registax? what checkbox am I missing?:-)

I've stacked in registax with these images and end up with trailing because of the rotation not being corrected during alignment/processing. In that circumstance Registax seems to only be aligning by moving in X and Y, not by rotating.

I thought I had heard Registax could do it, but having not found the feature I thought I heard wrong?

Roger.

Quote:

Originally Posted by [1ponders]

You can do it in Registax, but the result isn't always "predictable" I've had some stunning visual effects turn out though. You can also do a rotate in ImagesPlus as well.

rogerg (Roger) · #6 28-03-2006, 11:01 AM

Interesting - I didn't even know about "registar". I've found the website and will download the trial to give it a shot. The website is quite brief so I can't really work out if it should be able to do it or not.. we'll soon see.

Thanks,
Roger.

Quote:

Originally Posted by iceman

I would've thought "registar" could do it? It's a brilliant piece of software that can align and stack any number of odd shaped widefield images.

The trial version doesn't let you save, but it should give you an idea of whether it can do it.

seeker372011 (Narayan) · #7 28-03-2006, 10:22 PM

IRIS can do this...and its free ware.

[1ponders] (Paul) · #8 28-03-2006, 11:33 PM

What version of Registax are you using? In version 3 there is a button on the top right of the align page that when you click gives you the option of selecting two points around which the image will be rotated. Open your avi/bmps and select Rotate. Select your first alignment point and then Reg does and initial alignment. It then asks you to select a second alignment point and does a second alignment. Once that is finished you click "Limit" and then treat it like any other image enhancement.

rogerg (Roger) · #9 29-03-2006, 12:39 AM

Thanks Paul, not sure how I missed that one. I wish I could get help working in Registax v3, v2 it just came up, no sign of help in v3 to explain functions, can't find it on their site.

I have just tried the rotate, very bad result, will have to fiddle with it to work out how to get the correct result from it.

Thanks,
Roger.

Quote:

Originally Posted by [1ponders]

What version of Registax are you using? In version 3 there is a button on the top right of the align page that when you click gives you the option of selecting two points around which the image will be rotated. Open your avi/bmps and select Rotate. Select your first alignment point and then Reg does and initial alignment. It then asks you to select a second alignment point and does a second alignment. Once that is finished you click "Limit" and then treat it like any other image enhancement.

iceman (Mike) · #10 29-03-2006, 05:52 AM

I'm never had good results from registax rotate function. Registar does a much better job - how did it work for you?

rogerg (Roger) · #11 29-03-2006, 11:15 AM

I haven't got to Registar yet, will take a shot at it tonight hopefully, ran out of time last night at home..

Roger.

Quote:

Originally Posted by iceman

I'm never had good results from registax rotate function. Registar does a much better job - how did it work for you?

Striker (Tony) · #12 29-03-2006, 11:22 AM

Imagesplus can do it.

rogerg (Roger) · #13 30-03-2006, 12:32 AM

Mike,

RegiStar seems to have done a great job of aligning the images. Very little field rotation visible. Only problem is because I don't have a registered copy seems I can't save the image. US$149 is prohibitively expensive for me right now, so I'll return to RegiStax, attempting to do it there, hopefully get it sorted out soon.

Roger.

Quote:

Originally Posted by iceman

I'm never had good results from registax rotate function. Registar does a much better job - how did it work for you?

Gama · #14 30-03-2006, 01:52 AM

Maxim DL does it. Just click on 2 star alignment, and it will align all pictures with the 2 stars you have marked as the referece points. It then stacks them. If theres a error, then its because you have picked a wrong star in one of the images..
Just takes seconds.

[1ponders] (Paul) · #15 30-03-2006, 08:23 AM

Roger, once Registar has aligned the images take a screen capture and then paste it into your processing program, ie PS, Gimp etc. If you don't know how to take a screen capture, hold down the Alt key and hit the PrtSc key and a copy will be put on the clip board for pasting.

It'll be the whole screen including title bar, menu bar and tool bars but they can be cropped out.