Dark frame subtraction

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In digital photography, dark frame subtraction is a way to minimize image noise for pictures taken with long exposure times. It takes advantage of the fact that a component of image noise is the same from shot to shot: noise from the sensor, dead or hot pixels. It works by taking a picture with the shutter closed; ideally this would be completely black but in actuality it will have some variation or noise. This “dark frame” is later subtracted from the picture taken. This has been done for some time in scientific imaging. Some consumer digital cameras do this automatically.

[edit] External links

• Chris Limone. Dark Frame Subtraction using Adobe Photoshop

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