command line - Crop down to circle -

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i crop rectangular image down circle. ran command:

convert -crop 500x500+100+100 in.jpg out.jpg

however creates square rather circle.

convert in.jpg -extent 400x400+100+100 \   '(' +clone -alpha transparent -draw 'circle 200,200 200,0' ')' \   -compose copyopacity -composite out.png

this +100+100 part optional: allows shift viewport.

how make circle thumbnail graphicsmagick?


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