Digital camera sensor pixel is responsible for collecting photon and photon by photodiodes put into charge, followed by a series of processing, the formation of the image.
We in the "dynamic range" topic has been on the inside, upon receiving the "barrel" photon (bucket) loaded by additional photons into charge will overflow, and the overflow is not an object of value, so the impact will cause the value of photosensitive pixel is insufficient or overexposure. When the charge overflow to the next pixel to pixel in handling next to Photon processes overexposure (for example describes the sky bright pixel is charge overflow leaves or branches on the edge of the darker pixel overexposure), this is the "highlight overflow". Highlight overflow will void the picture loss of detail, but also increases the chance of purple edges appear.Some of the sensor with the "highlight overflow protection" (anti-blooming gates), absorption, reducing the charge of overflow overflow charge on nearby pixels.
This function can suppress overflow highlights basic unless photos very strong light-dark contrast or due to anthropogenic causes serious too exposed photos.
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