Cropping images with RMagick after uploading with acts_as_at

Hi,

I’m using acts_as_attachment to create thumbnails in a filesystem (no
problem there), but I’m having a rough time figuring out how modify
the image to crop it, and then put it back into the filesystem.

I think that I can pull the image OK and modify the Image OK with
RMagick.

So really I just need a pointer on putting it back into the filesystem
as a modified thumbnail, but a semi-complete example would be a bonus.

Thanks

Matt

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