Hi,

I was curious about this problem thinking there must be an easy way to
do it. I found that it's possible:

0. cd to the directory with your images in (work on a copy if you are unsure)
1. in Gimp select crop tool options and 'fixed aspect'; enter the
aspect ratio (x:y resolution) you want.
2. Ctrl-o (to open the image you are interested in); up and down arrow
then enter to choose the image
3.Shift-c to select the crop tool and swipe over the area you want.
Press enter to confirm the crop.

Note you now have the image in the right aspect ratio but maybe larger
or smaller than the actual size you want. Don't worry about it.

4. Shift-s to save the image
5. Ctrl-w to close the image.

6. repeat until all the images have been cropped.

Next, since all the images are the wrong size, but the right aspect,
scale them. There is no interaction needed as you have already made
the editorial decision of the crop. All you need to do is a batch
command to resize the lot of them in one go:

mogrify -resize '938x340!' *.jpg

Try it... just remember to work on a copy of the images in case you
don't like the results.

-Cam

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