Sharpen or Blur
A common problem in digital images is loss of sharpness. Shrinking or scanning a photo can blur it.
There is a simple window available in Zoner Photo Studio to Sharpen/Blur an image. For a stronger sharpening effect often used in artistic photography, there is also a second slider here. If you shrink images often, you will be glad to know that a resharpening function is also provided in all image-resizing dialogs.

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