Long Exposure Noise Reduction
The extended exposure times associated with light painting and night photography can cause a different type of noise called long exposure noise. Unlike high ISO noise, which looks grainy, long exposure noise displays as random pixels turning red, green, or blue. These pixels are called “hot” or “stuck” pixels (Figure 2.15).
Figures 2.15: Close-up of hot pixels in an image displaying long exposure noise.
During a long exposure, the sensor heats up, causing individual pixels to get “stuck,” creating the look you see above. As you can see, this type of noise is particularly undesirable. It’s also nearly impossible to ...
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