Sometimes, when you scan a photo, you’ll see a pattern over all the image. In order to correct this, you can try to blur the blue channel doing the following:

  1. With your image open in Photoshop, click on the Channel tab and click on the Blue Channel.
  2. Click on Filter, Blur, Gaussian Blur. The Gaussian Blur window is going to open; move the Radius slide to 2 or 2.5 pixels.
  3. You can blur the other channels also, but using lower settings.
  4. The image needs some sharpening at this point. Click on Filter, Sharpen, Unsharp Mask.

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