Tuesday, December 10, 2013
Photoshop Blur Filters, Part 2
How to use Smart Filters, Blur Tools and Blur Effects to control blur in your images
|This Article Features Photo Zoom|
Each filter has a blur ring. The central point controls the position of the effect; the outer ring dynamically adjusts the Blur slider. Pins can be used to place additional blur rings with overlapping fields of influence that will feather into one another gradually, making it easy to apply different filter settings to different image areas.
Radial Blur surrounds each blur ring with a second larger double ring. The outer line can be used to adjust the size of the blur field, and it has one square radius roundness knob that makes the field rounder or squarer, and four outer ellipse points to adjust the shape and angle of the radius field. Between the outer line and the center double ring are four inner ellipse points that control the gradient effect between the center and the outer ring; dragging one point will move them all equally unless you hold the Shift and Option/Alt keys to control a single point.
You can easily combine Iris and Tilt-Shift blur effects, as the pins interact with each other using the same Blend mode (similar to Multiply) that adds the blur radius fields from each effect, as well as the areas of clarity. Where there's an overlap, the clarity is preserved.
To customize blur effects even further, you can apply filters multiple times at different settings and in different combinations. This field is rich with possibilities.
All blurring can cause posterization. Guard against this by checking at 100% screen magnification. Often, posterization can be cured by adding small amounts of noise.
(See my column on adding noise on the Digital Photo Pro website at www.digitalphotopro.com/technique/revolution.html.)
John Paul Caponigro, author of Adobe Photoshop Master Class and the DVD series R/Evolution, is an internationally renowned fine artist, an authority on digital printing, and a respected lecturer and workshop leader. Get access to a wealth of online resources with his free ennews Insights on his website at www.johnpaulcaponigro.com.
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