In Aperture, EDGE SHARPEN gives photographers significantly more control than was available using the standard SHARPEN adjustment.
With Edge Sharpen, only the edges are impacted. This is important because there are times when sharpening an entire image just isn’t required. Who needs a sharp sky?
The main value of Edge Sharpen is that if applied properly, you can sharpen without creating noise.
One of my favorite things about this adjustment is that it works only on luminance, not in the RGB space. Long ago Id learned the trick of converting images in Photoshop to LAB space so I could sharpen without creating color artifacts. Now I don’t have to do anything. Aperture does it for me.
Some of my students have asked what it means to sharpen in the perceptual space. Simply put, this helps to sharpen in approximately equal steps between shadows and midtones.
And finally, whats this slider called FALLOFF? Aperture applies Edge Sharpen in three passes. Each pass uses less intensity than the previous pass. This eliminates halos.
There is no formula that I can give you to sharpen your pictures since there are too many factors involved. But a good rule of thumb is to set the intensity to full blast to see the impact of your adjustments. You can back it off later. Then adjust the Edges slider so you can see whats being sharpened. Falloff controls how much sharpening is delivered during each pass. I find that Apples recommended range of .40 to .70 is a good starting point.
I like to work in full screen mode so I can see how the sharpening is being applied. Experiment, and see what settings typically provide good results. Lastly, don’t over sharpen. Its tempting but, don’t do it. A little sharpening goes a long way.
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