Displaying a scaled down picture and drawing a rectangle on it

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Cecil Westerhof

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Jul 19, 2016, 6:18:57 AM7/19/16

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At the moment I am using Image Magick on the command line with trial and error to crop the right part of the photo. For example:
https://www.instagram.com/p/BH7r97NgvFX/

But
 this is a ‘bit’ of work. So I was thinking about writing a Clojure 
program to do the cropping for me. That would save me a lot of time I 
think and the best way to learn a language is to use it. I think I could
 manage most parts, but I need a little help.

My
 pictures have a dimension of 5,184x3,456 and I need to make a crop of 
1.080x1.080. This is a little to big for my screen. So I am thinking 
about dividing everything by 8.

I need to know two things:
- How would I display the picture as a 648x432 picture?
- How do I draw a square of 135x135 on it? So I can select what to crop.

Cecil Westerhof

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Jul 19, 2016, 9:49:26 AM7/19/16

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​I first wrote a Java program. ;-) It could be made better, at the moment I have to click to position the square, but that can always be later improved. (Dragging would be better, or there should probably be both options.)

Am I on the right track, or should I do this completely different?

If I am on the right track, I will translate it to Clojure.