How to increase the DPI of the image and make it sharper?

Question

I want to increase the resolution of the image to 300 dpi, and I also have a text image that cannot be read, so I want to increase its size and clarity. How can i do this?

............... from the beginner

Answer 1

If you have a blurry image, you cannot unlock it - the information is simply already lost. An increase in image resolution on an existing image also cannot add information. All you can do is interpolate existing functions.

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