Question

what is spot healing brush tool in computers.

Answer 1

The spot healing brush is the default healing tool in Photoshop and can be used to clone areas from an image and blend the pixels from the sampled area seamlessly with the target area. The basic principle is that the texture from the sample area is blended with the color and luminosity surrounding wherever you paint.
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Answer 2

$<i>$ hey mate

here's your answer, ✔✔

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It allows us to correct imperfections like dark spots, scratches etc causing them to disappear into the surrounding image . like the clone . we can use healing brush to paint with the same sampled pixels from an image.

✔✔ hope it helps you ✔✔