0 Replies Latest reply: Jan 23, 2004 8:59 AM by (Phos±four_dots) RSS

    Haloless Sharpening - A Quick Tutorial by Mathias Vejerslev

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      Haloless Sharpening - A Quick Tutorial


      Originally posted by Mathias Vejerslev - 08:46am Jan 23, 2004 Pacific

      I was writing this up for a friend somewhere else, and thought I might as well post it here for those that are not aware.

      Layer Blending in Photoshop can be used for a great many things.
      Amongst those are halo less sharpening. I think I became aware of ALB
      about two years ago, and I have used it since in many different

      Here´s how to reduce halos when sharpening (its a quick example, mind you):

      The lower of the three is unsharpened. I duplicated that layer, and obscenely oversharpened with USM (middle).

      Then I right-clicked that layer, and set the blending options like this:

      Which resulted in what you see on top (still a little too sharp, but you can simply reduce the opacity of the layer to taste).

      do this by Alt-dragging the triangle sliders to create a
      semi-transparent blend of the extreme whites and extreme blacks, in
      order to emphasize the midtones of the current layer. You can quickly
      determine how far you must go by simply dragging the endpoints to where
      the annoying halos dissappear, then split the endpoint to this position
      to blend it.

      You can use this technique with other layer based
      sharpening techniques such as High Pass sharpening and others with
      great effect, as you can sharpen much more without visible halos.

      This is a variation dubbed midtone sharpening.