Open up photoshop and get the image thats quality you want to improve or enhance. Im using this:
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Now go to Filter > Blur > Gaussian Blur. How big your image is depends on how much you put in but for me, i used 5. The point of this is blurring it so there are no details to see but seeing the image is still possible. Now it should look like this:
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Now after youve done that go to Edit > Fade Gaussian Blur and set the setting to 100% and Hard Light.
Your outcome: