In this example, I took the 9rules logo and pixelized it. To do so, I take the original image and size it down nice and small. The smaller you go, the more pixellated it'll look when it's resized back up. Before you resize up, though, go into your preferences and change the Interpolation to Nearest Neighbor. When you resize up, you'll see the image is now wonderfully pixellated.
But one thing you have to be careful of is to change Interpolation back to Bicubic if you want to resize the original image back down again (or a smaller image even smaller). In this next example, the middle version is where the original image has been resized down and then back up using Nearest Neighbor. Whereas, the version on the right used Bicubic to resize down and Nearest Neighbor to resize up.
As you can see, the last version is more recognizable than the middle version.
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