Real World Image Sharpening with Adobe Photoshop, Camera Raw, and Lightroom by Bruce Fraser Jeff Schewe & Jeff Schewe

Author:Bruce Fraser,Jeff Schewe & Jeff Schewe
Language: eng
Format: epub
Publisher: Pearson Education Limited (US titles)
Published: 2010-03-18T04:00:00+00:00

The key to using Surface Blur successfully is to localize the application both by using a surface mask as well as using reduced opacity. We’ve often found that applying Surface Blur and applying the result at 50% opacity allows a reduction in the perception of strong noise. The noise is still there because the opacity is reduced. But the gentle use lessens the strength of the naturally present noise.

Noise Reduction with Despeckle

The Despeckle filter is useful for dealing with mild-to-moderate luminance noise (as opposed to color noise). The secret is to apply Despeckle differentially to the three color channels—the red channel usually has the least noise, and the blue channel usually has the most.

Figure 4-39, below, shows the result of this technique, which is a simple filter menu command (Filter > Noise > Despeckle), in action along with additional noise-reduction tools. When overdone, this technique can produce color shifts, but it provides an easy way of knocking back some of the worst of the noise. As with all sharpening and noise-reduction tools, it’s best applied to a copy of the image.

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