: Reverse Nearest Neighbor Algorithm in Image Scaling in Photoshop Is there a way to reverse this method of image scaling in Photoshop? This is an example of what I mean: http://tech-algorithm.com/uploads/nneighbor01.png

@Karen819

I managed to understand that the Nearest Neighbor Algorithm is reversible by definition. Example:



I just want to say that, in order to preserve quality, colors and square-shape for each pixel, you have to keep same aspect ratio. To do so, starting for example by a 16x16 image, you have to resize multiplying or dividing by multiples of two, otherwise you will obtain errors resizing like so

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