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Sharpen Your Images With More Control Using Photoshop
 
Make your pictures look crystal clear with sharpening. Scanners and digial cameras make images a little soft. Do not sharpen with the digital camera or scanner. If you do, you're stuck with it forever. Turn off sharpening, you can always make an image look sharper in Photoshop. Instead of using the sharpen filters in photoshop, do it manually. It will offer more control over your images than the filters and it will do a much better job.
   
  Once you have opened the image in Photoshop, follow these steps:
   
  1. Duplicate the layer (ctrl + J, cmd + J) twice.
  Photoshop Sharpen Tutorial step 1
   
  2. Blur the top layer by about three pixels.
  Photoshop Sharpen Tutorial step 2
   
  3. Invert the image (ctrl + I, cmd + I)
  Photoshop Sharpen Tutorial step 3
   
  4. Set the layer opacity to 30 %. You'll get a gray image with black-and-white haloing.
  Photoshop Sharpen Tutorial step 4
   
  5. Group the top layer to the layer below it (ctrl + G, cmd + G)
  Photoshop Sharpen Tutorial step 5
   
  6. and set that layer to Overlay layer blending.
  Photoshop Sharpen Tutorial step 6
   
  If you turn the layer on and off, you should see the sharpening effect. You can adust sharpen masking by playing with the layer opacity, overlay, and blur. Check out the before and after below:
  Photoshop Sharpen Tutorial before Photoshop Sharpen Tutorial after
  Before After
   
  What just happened?
  When a layer is inverted and blurred; colors bleed at the edge of high-contrast areas. Blurring the inverse of the image leaks light on light and dark on dark just around the edges (These edges are where you want to increase the sharpness, not the rest of the image). This increases the perception of sharpness when overlayed on the original image.