Special Effect 4: Add Realistic Film Grain Or A Mezzotint Pattern

This book offers several techniques to remove digital noise or grain from an image. However, you may have times where grain is very desirable. Photoshop 7 has several filters that can be used to add grain to an image, such as Noise and Grain. However, those filters are vastly less sophisticated than the grain producing plug-in, Grain Surgery by Visual Infinity (www.visinf.com ).

Grain Surgery not only removes grain, but it can create grain in both black and white images as well as color, and it can match grain from one image and place a similar grain in another image. This means

that, for example, you could cut out a butterfly with little grain from one image, place it in a grainy image, and then use Grain Surgery to add a matched grain in the butterfly. Or, you can use Grain Surgery to just add grain to an image, such as the iris image shown in Figure 41.13. After first converting the image to black and white by using Convert to B&W Pro, Grain Surgery was used to add a Kodak TRI-X Pan 400 BW grain. The results are shown in Figure 41.14. Figure 41.15 shows the Grain Surgery — Add Grain dialog box.

If you want to add something more sophisticated than film grain to an image, the Andromeda Software (www.andromeda.com) Screens plug-in converts gray-scale images into a wide variety of different line


art screens, such as mezzotints, sharp contrast mezzo grams, mezzo blends, ellipses, lines, circles, spokes, waves, or any blended combination.

Figure 41.16 shows an image of an old pocket-watch. After converting the image to black and white, the Screens plug-in was used to apply a mezzotint which resulted in the image shown in Figure 41.17. Figure 41.18 shows the controls that you have over the Screens effects.

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