Sharpen images online

 In the Photoshop Sharpness menu, you'll find four filters that I ignore: Image Stabilizer, Sharpness, Sharpness+ and Edge Sharpness. Let's see why.

Sharpen images online

Image Stabilization is a powerful filter with a very specific purpose: removing blur from camera shake. This topic can be dealt with in a separate lesson, but it has nothing to do with sharpening. In my opinion, however, to avoid camera shake, it is better to use a suitable shutter speed rather than relying on Photoshop.


The Sharpness filter is the base filter for Sharpness+ and Edge Sharpness. All three of these outdated filters are not recommended by Adobe. They apply an amount of sharpness to the image that is set automatically. You have no control whatsoever. Sharpness applies a small amount, Sharpness+ is a little stronger, and Edge Sharpness focuses only on the edges, ignoring the rest of the image. These filters have no place in a good post-processing process.

Now let's take a look at the filters that should be used.

 



Contour sharpening: quick and easy

Contour sharpening is a film technique where the blurred copy is subtracted from the original image; this creates an "unsharp mask" of the edges. The mask is then applied to increase the contrast on those edges.  

You can roughly mimic this effect yourself in Photoshop:

Convert the image to black and white.

Duplicate the original image.

Apply a slight Gaussian blur.

Change the blending mode to Subtract. This will create an unsharp mask on the edges.

Create a new layer and apply Merge Visible.

Change the blending mode to Screen and disable the layer with the unsharp mask.

The original file will now look sharper (bad enough).

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