Many different methods are available, one of them is to reduce the number of pixels in the area.
say if there was 100 pixels in an area, you reduce that to 10 pixels. So that some information is still there but the rest no longer exists.
Because you have written over the data(image) with new data (pixelation). The original data(image) no longer exists.
Much like whisking an egg, you can’t ever get just the yoke seperate again.
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