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Removing Noise

Some digital photos have annoying random variations in color or intensity, called noise. This results from electrical noise in the image sensor, and is conceptually similar to film grain. You'll notice the most noise in images from low-cost sensors, such as those in Web cams or camera phones, and in images from cameras whose ISO (sensitivity) setting is set above the minimum value.

In most cases, you can significantly reduce the noise while preserving nearly all details. Open the photo in Standard Edit and choose Filter > Noise > Reduce Noise. The Reduce Noise dialog (Figure 6.23) shows a preview of part of the image at 100% (actual pixels) zoom level. You can increase or decrease the zoom level by clicking on the plus and minus buttons, or pan by clicking and dragging in the image preview.


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