Have you ever looked at your camera's LCD screen and been completely happy with the overall look of your images--only to later realize that they are full of "noise"?
Digital camera noise can take on a number of looks. It can look of big grains of sand across the whole image, or a lack of detail in dark areas, or colorful "specs" in the light or dark areas of your image.
Noise is usually the result of underexposure or by setting your camera's ISO at a high level (each camera behaves differently). Long exposures or a very warm environment can also contribute to high noise levels. Very small imaging sensors, like those found in most cell phones, often produce images with significant noise (especially color noise). Using cameras with sensors that have larger photo sites (like many DSLRs) and shooting in RAW (when possible) can help to reduce noise because of the added control you have after the shot.
What can you do to reduce noise? One approach is to convert to LAB space in Adobe Photoshop, and blur the A and B channels using Gaussian blur or the Dust and Scratches filter. The A and B channels represent the color information in a file, so by targeting the color detail, you can reduce the color noise.
Andrew Darlow
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