In photography, noise shows up in an image as we increase our ISO setting, creating grainy textures which get in the way of the details in the image that we were hoping to capture (the signal). With a poor signal-to-noise ratio, however, static takes over to the point that you can no longer enjoy, or even hear, the music through your speakers. With a good signal-to-noise ratio, the static on that radio station will be minimal or even imperceptible. On a radio station, for example, noise is the static accompanying an otherwise clear song coming through your speakers. With any digital signal also comes noise. In digital photography, noise refers to random, irregular specks and grainy patterns in an image. What Is Noise?īefore diving head first into reducing noise in our photos, it’s important to have an understanding of what noise is and what causes it. And until technology improves to the point that noise is a thing of the past, noise reduction is a skill that every photographer should be knowledgeable about. As much as we would love to capture photos with exposure settings that yield the cleanest possible image, many shooting situations call for us to make the choice between getting either a noisy photo or no photo at all. Even though the low light capabilities of today’s cameras continue to improve, noisy images are still a common challenge among photographers.
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