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Dark-frame subtraction

Index Dark-frame subtraction

In digital photography, dark-frame subtraction is a way to minimize image noise for photographs shot with long exposure times, at high ISO sensor sensitivity or at high temperatures. [1]

14 relations: Astrophotography, Bias frame, Dark current (physics), Defective pixel, Digital photography, Fixed-pattern noise, Flat-field correction, Image noise, Image sensor, Long-exposure photography, Photogram, Photogrammetry, Pixel, RawTherapee.


Astrophotography is a specialized type of photography for recording photos of astronomical objects, celestial events, and areas of the night sky.

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Bias frame

In digital photography, a bias frame is an image obtained from an opto-electronic image sensor, with no actual exposure time.

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Dark current (physics)

In physics and in electronic engineering, dark current is the relatively small electric current that flows through photosensitive devices such as a photomultiplier tube, photodiode, or charge-coupled device even when no photons are entering the device; it consists of the charges generated in the detector when no outside radiation is entering the detector.

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Defective pixel

Defective pixels are pixels on a liquid crystal display (LCD) that are not performing as expected.

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Digital photography

Digital photography is a form of photography that uses cameras containing arrays of electronic photodetectors to capture images focused by a lens, as opposed to an exposure on photographic film.

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Fixed-pattern noise

Fixed-pattern noise (FPN) is the term given to a particular noise pattern on digital imaging sensors often noticeable during longer exposure shots where particular pixels are susceptible to giving brighter intensities above the general background noise.

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Flat-field correction

The brightness variation due to vignetting, as shown here, can be corrected by selectively brightening the perimeter of the image. Flat-field correction is a technique used to improve quality in digital imaging.

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Image noise

Image noise is random variation of brightness or color information in images, and is usually an aspect of electronic noise.

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Image sensor

An image sensor or imaging sensor is a sensor that detects and conveys the information that constitutes an image.

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Long-exposure photography

Long-exposure, time-exposure, or slow-shutter photography involves using a long-duration shutter speed to sharply capture the stationary elements of images while blurring, smearing, or obscuring the moving elements.

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A photogram is a photographic image made without a camera by placing objects directly onto the surface of a light-sensitive material such as photographic paper and then exposing it to light.

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Photogrammetry is the science of making measurements from photographs, especially for recovering the exact positions of surface points.

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In digital imaging, a pixel, pel, dots, or picture element is a physical point in a raster image, or the smallest addressable element in an all points addressable display device; so it is the smallest controllable element of a picture represented on the screen.

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RawTherapee is a cross-platform raw image processing program, released under the GNU General Public License Version 3.

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Redirects here:

Dark frame, Dark frame subtraction, Dark-field subtraction.


[1] https://en.wikipedia.org/wiki/Dark-frame_subtraction

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