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Random sampling makes a lot of intuitive sense, but unfortunately doesn't work well. I just answered over at lobsters: https://lobste.rs/s/t43mh5/okmain_you_have_image_you_want_co...

I should probably add this nuance to the post itself.

Edit: added a footnote

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How about sampling more from the more "prominent" areas of the image[0] and less from less "prominent" areas?

[0]: https://dgroshev.com/blog/okmain/img/distance_mask.png?hash=...

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