Graphics Programs Reference
In-Depth Information
XI. Noise and Interference in Digital
Capture
AKA Grain in the Film World
In order to optimize image data for the highest quality digital
capture, monitoring and controlling the desired ef ects of noise
produced is another important component of the capture workl ow.
Although many of the latest high-end DSLR camera systems have
evolved to bring us signii cant new advances in noise reduction,
of ering a sensitivity to light far surpassing the grain equivalence of
i lm, noise can still be an issue for the digital photographer.
Film grain
Digital noise is created by randomly scattered pixels across a digital
image. The ef ect is similar to the grain we traditionally see in i lm
photography. Noise is usually most visible in images captured in
very low light, and with slow shutter speeds or higher ISO sensitivity
modes. It also appears in areas that are underexposed.
Digital noise
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