resizing / rescaling images to allow for image alignment

[Forum_2018]

i created an RGB image then cropped it before trying to integrate a luminance so the two images were different sizes. I can't find out how to resize or rescale either image to map onto the other image to allow alignment. Any suggestions welcome

[Forum_2018]

Try coregister in the image menu it will align and scale one image to the other.

Iver

[Forum_2018]

Thanks Iver. I had to look that up. Found a cool link at http://users.libero.it/mnico/lab/tut_en8.htm

[Forum_2018]

In case you didn't look in the AA manual, be sure to follow #2 and select the same stars in the same order!

This command aligns two images which are shifted, rotated and scaled.

Procedure

1. Select three points or three stars on the first image.

2. Select the same three references, in the same order, over the second image.

3. Click menu Image / Coregister

Example

Suppose that there are 2 images, A and B on the desktop, both with the three points selected.

If image A is active when Coregister is clicked then a new image C is created, and it is a rotated/rescaled version of image A, but can be blinked with image B.

If B is active then the new image C is a rotated/rescaled version of B, and can be blinked with image A.


Iver