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Depending on the physical structure of the sensor, a color filter array may be used, which requires demosaicing to recreate a full-color image.
The number of pixels in the sensor determines the camera's "pixel count".
The third method is called scanning because the sensor moves across the focal plane much like the sensor of an image scanner.
The linear or tri-linear sensors in scanning cameras utilize only a single line of photosensors, or three lines for the three colors.
However, unlike film cameras, digital cameras can display images on a screen immediately after being recorded, and store and delete images from memory.Scanning may be accomplished by moving the sensor (for example, when using color co-site sampling) or by rotating the whole camera.A digital rotating line camera offers images of very high total resolution.In case of a digital camera, a simplistic way of expressing it is that the lens determines the maximum sharpness of the image while the image sensor determines the maximum resolution.The illustration on the right can be said to compare a lens with very poor sharpness on a camera with high resolution, to a lens with good sharpness on a camera with lower resolution.