Rotated images sometimes look grainy and unnatural, making it easy to eliminate certain incorrect options #5
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Reference: cerealxp/FreeCAPTCHA#5
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Here is an unrotated image of a gnome presented by freecaptcha:
Now, upon clicking:
Notice that the resolution declines considerably.
It is not clear to me why this happens. Does resolution necessarily drop when an image is rotated? Is it a problem with the specific tool I'm using? What tool are we even using to rotate images, and what are the alternatives?