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The After Effects Illusionist, 2nd Edition by Chad Perkins

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4The Blur & Sharpen Effects

The effects in the Blur & Sharpen category all soften (blur) an image, or make it more crisp and detailed (sharpen). There is a little skew in the balance here, as only 2 of the 13 effects in this category deal with sharpening (and only one of those is any good). The remainder all apply some degree of blur.

Blurring is useful in After Effects for a whole host of reasons. It can soften an image, or parts of an image to create a focal point for the viewer. Blurs are frequently used with motion graphics to create wispy or glowing elements. Blurring is also commonly used with particle effects such as Particle Playground or Radio Waves, when creating objects like snowflakes or glowing sparkles. Blur can be used in compositing, ...

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