I try to edit a photo in Photoshop by just dragging it in, the image is too small so I transform it to make it large enough to fit the screen. It shows a nice picture but whenever I deselect, it looks awful and sharpening tools don't work. I need help. enter image description here

enter image description here

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    You need to use nearest neighbour interpolation when applying transform. Possible duplicate: How do I preserve hard edges not working in Photoshop? – Sergey Kritskiy Sep 30 '19 at 6:17
  • Raster images lose their quality when they are resized. While the loss of quality is less noticeable when their real size (100% zoom) is reduced, it becomes evident when this size is increased. In this case it is advisable to use the Preserve Details resampling method, that we find in Image > Image Size. – spike_66 Sep 30 '19 at 9:30
  • @spike_66 - "preserve details" won't work well with a pixel art image such as that shown by the OP. The best interpolation to use in that case is "nearest neighbour" as mentioned by Sergey, and in the duplicate questions. – Billy Kerr Sep 30 '19 at 11:53
  • @Billy Kerr - in fact I used this method mainly for photos that had to be adapted to larger formats. I thought it could be useful also in this case. Thanks for pointing this out. – spike_66 Oct 1 '19 at 8:19

If you do ctrl + K, you will open up preferences. You want to change where it says "Image Interpolation" and select nearest neighbor. That will solve the problem.

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