Removing Film Grain and Scanner/Camera Noise
Sharpening an image will exaggerate almost all the detail in the image, so any film grain will also be exaggerated (Figures 6.3 and 6.4). That’s fine if you want an image with pronounced grain, but if you prefer a smoother look, check out the techniques in this section for removing grain from images. As we get into this topic, much of the time we’ll refer to film grain as noise.
Figure 6.3. An old black-and-white image scanned from a 35 mm negative can have some film grain. (©2008 Dan Ablan.)
Figure 6.4. When sharpened, the noise in the image from Figure 6.3 is exaggerated. ...
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