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I've always drawn over sensitive parts in Paint or something, then taken a screenshot of it. It makes sure that everything is compressed to a single layer and can't be undone.

Just be sure to get all of it. It's pretty common that people leave a few pixels. How not to do it: https://imgur.com/ZaCIY5P

Leave generous margins. JPEGs can have compression artifacts that leak information outside the boundaries of the object.

It shouldn't matter if the original image (the screenshot) didn't contain any information to leak.

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