A digital camera uses a sensor array of millions of tiny pixels to produce the final image. When you press the shutter of his camera and starts the show, each pixel is a “photosite” to be discovered to collect and store photons in a cavity. After the exposure, the camera closes in each of the photosites, and then try to estimate the number of photons fell into each. The relative amount of photons in each cavity are classified into different levels of intensity, the accuracy is determined by the bit depth (0 – 255 for an 8-bit image).
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