Tuesday, January 3, 2012
High Pass Sharpening
Try this advanced technique for creative sharpening effects
|This Article Features Photo Zoom|
4) The High Pass filter
You can increase the intensity of the effect by adding contrast to the High Pass layer. Use a Curve adjustment, lock down the midpoint (128/128/128), and add the amount and kind of contrast you desire.
You can accentuate the effects of the High Pass filter by sharpening the image layer with Unsharp Mask before filtering it with High Pass. Doing this will give the High Pass filter more to grab onto. Try a double pass of Unsharp Mask. First, apply Unsharp Mask with a high Radius (1.5) and a low Amount (100%); second, apply Unsharp Mask with a high Amount (350%) and a low Radius (0.5). Your settings may vary, so use these numbers as starting points to produce a maximum effect with minimal artifacts.
When you use high Radius settings for the High Pass filter, High Pass sharpening moves beyond sharpening and becomes tonal enhancement. The halos/lines it produces become so broad and feathered that they accentuate planar contrast rather than contour contrast. They also can cause localized vignetting effects, for better or worse. This isn't surprising; all sharpening is a type of localized tonal enhancement targeted to detail (contour and texture) instead of the broader tonal scale.
5) Layer Styles' Blend If sliders for the High Pass layer
Precise sharpening can improve almost any image. Master sharpening, and you can gain unprecedented control of detail in your images and take them to a new level. Choose the type of sharpening that produces the effect that's most appropriate for an image or that you find most pleasing. With careful consideration and consistent application, you even can create your own sharpening style and give your images a special look, one that renders your unique visual voice more clearly.
John Paul Caponigro, author of Adobe Photoshop Master Class and the DVD series R/Evolution, is an internationally renowned fine artist, a lecturer and workshop leader. Join over 20,000 other Insights enews members and get access to hundreds of digital imaging resources at www.johnpaulcaponigro.com.
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