I've got a few hundred photos of the November 2012 eclipse, and I'd like to compose them into a time series. To do that, I'd like to crop all of them to the same size, a square with a little space between the Sun and the edge of the image. Using ImageMagick I was able to create the following image with
convert original.jpg -fuzz 5% -trim +repage cropped.jpg:
Alright for a first step, but how can I make sure that
- the borders on all sides are approximately the same size and
- the image center corresponds to the center of the Sun (that is, the extrapolation of the outer arc), rather than the center of the bright area?
Manual methods are not feasible, because of the amount of images.
Here are the first three images: