Dark Frame Subtraction - This technique lets you get rid of 'hot pixels' in images that have been subjected to long exposure.
Dark Frame - A noise reduction process whereby a camera takes a second exposure of a black frame after the camera takes a long exposure (1/2-second or longer) image.
Dark frame
Manually cleaned image
The effect of long exposure stuck pixels can be reduced to a great extent by taking a "dark frame" (with lens cap on) either before or after the main shot and subtracting this from the original shot, ...
Dark Frame
This is a method to reduce image noise, or hot pixels, that can appear in a picture taken with a long exposure time. Once the picture is shot, a second picture is taken of just a black image.
Dark Frame An image of the dark current and camera readout and bias signal made by integrating an image while keeping the CCD array in total darkness.
Light and shadows - shooting at an angle that will result in a dark frame, or the opposite - using the flash to brighten the frame, will reduce the dominance of a frame.
techniques involve capturing multiple images to composite together in an additive process (negating tracking issues and bringing out dim objects), as well as using image processing to filter out light pollution and subtracting a 'dark frame' to ...
Use your cameras noise reduction (or dark frame subtraction) feature to get cleaner images.
Different light sources can confuse the automatic white balance of your camera.
These can be successfully removed by taking a 'dark frame' before or after the main shot, with the same shutter speed as the main exposure, and subtracting this from the original to replace the stuck pixels.
Long shutter speeds (you'll need a tripod) can turn subjects into abstract-looking streaks, or have bright lights such as car lights and fireworks trace themselves across an overall dark frame.
Now you’ve found the feature, you have to decide whether you want to use it. It has potential quality benefits but there’s a big downside too. In-camera noise reduction (NR) works by the camera shooting a ‘dark frame’ ...
Once the photo has been taken the camera subtracts any noise present in the dark frame.
 See also: Frame, Exposure, Camera, Noise, Image
  
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