I create a new image 200 X 200 or 100 X 100 copy and paste it as a new layer over my image. I make it transparant and move it around until I have a thumbnail I think is interesting. I select that, move to the lower layer (the image) copy and paste as new image. Then of course I delete the layer with the square off my finished image.....

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo