I've searched for the answer here and online, but to no avail.

MSPaint only allows 90 degree increment rotations, so I want to tessellate using Paint.net instead. But when I clone an image, it comes out with a white "shadow" around the whole edge (see attached image). In MSPaint, all I have to do is hit the "transparent" button to get rid of the "shadow," but in Paint.net, I don't know how.

I'm adding an example of my tessellations (most famous tessellator was Escher; compilation of his tessies here):

enter image description here

transparent

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    What shadow? Do you mean the big white frame cutting the gray square? – Rafael Sep 9 at 18:24
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    Hi Wordster. Welcome to GDSE. Unfortunately I'm not sure I understand your question. What do you mean by "when I clone an image"? Any chance you could post an example of what you are actually trying to achieve? Software such as MSPaint and Paint.NET is very basic, and might not be suitable for what you are trying to do. In particular I'd say raster image editors are not the best for this. Much better to use a vector image editor. – Billy Kerr Sep 9 at 18:49
  • @Rafael: yes, the white frame cutting the lighter square. – Wordster Sep 9 at 18:53
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    Honestly, GIMP or even Photoshop wouldn't be my first choice either. This is really a job for a vector image editor - such as Illustrator (not free) or Inkscape (which is free). Have a look into that. – Billy Kerr Sep 9 at 20:05
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    Inkscape 0.92 allows arbitrary rotations using the object rotation handles, stepped rotations of 15 degree increments while holding down CTRL while rotating with the handles, and specific angular rotations via the transformation rotation options. – Billy Kerr Sep 10 at 0:23

Use layers. You'll have better control of the irregular edges of your objects. You can export a flat JPG after you finish manipulating the image to your liking.

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