Aka pixel shift stitching
Method
There are numerous tutorials providing instructions for creating a super resolution image in Photoshop – this one by Ian Norman on PetaPixel is among our favorites. Distilled down to its simplest terms, there are four easy steps:
Bring all images into Photoshop as a stack of layers
Resize the image to 200% width and 200% height using 'Nearest Neighbor'
Auto align all the layers
Average the layers by setting each layer's opacity to 1/layer number (the 1st layer will be 1/1 so 100% opacity, the 2nd layer will be 1/2 so 50% opacity, and the 4th layer will be 1/4 or 25% opacity, and so on).
Sharpen the image using a Radius setting of 2, and a suitable Amount setting …