Friday, April 10, 2009
The first in a series of columns about controlling noise
|3 The Add Noise Filter||4 The Texture Filter Offers|
Noise can come in many forms. Organized or random patterns. Small-, medium- or large-sized, or a combination of all three. Hard- or soft-edged. Monochromatic or polychromatic, of any hue and saturation level. Light or dark. Targeted in specific tonal ranges (shadows, midtones and/or highlights). You can customize the look and feel of noise in your images with a relatively simple digital-imaging tool set. Photoshop offers two filters that are particularly useful for noise effects.
5 Imagenomic RealGrain Interface
Grain (Filter > Texture > Grain) offers more control over the patterns generated: Regular, Soft, Sprinkles, Clumped, Contrasty, Enlarged, Stip-pled, Horizontal, Vertical, Speckle. All of them are useful. Horizontal and Vertical create patterns that are so regular that they’re the least likely to be chosen.
If you still haven’t found what you’re looking for, consider third-party plug-in noise generators such as Imagenomic RealGrain or Nik Color Efex and Silver Efex Pro. (My old favorite, Grain Surgery, is hard to find; it can sample the noise structure of any existing element and create a custom algorithm to simulate it on the fly.)
John Paul Caponigro, author of Adobe Photoshop Master Class and the DVD series R/Evolution, is an internationally renowned fine artist and authority on digital printing. Get over 100 free downloads and his free e-news Insights at www.johnpaulcaponigro.com.
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