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A megapixel is 1 million pixels, and is usually used to express the resolution capabilities of digital cameras. For example, a camera that can take pictures with a resolution of 2048×1536 pixels is commonly said to have "3.1 megapixels" ().
Some digital cameras (digicams) use CCDs, which record brightness levels. Older digital cameras that do not use Foveon X3 CCDs have Red, green, and blue colour filters so that each pixel can record the brightness of a single primary colour. Thus, the pixels of digital cameras that don't use Foveon X3 CCDs are similar to sub-pixels. The camera interpolates the colour information to create the final image. Thus, an 'x'-megapixel image from a digital camera can have as little as 1/4th the colour resolution of the same image as taken by a scanner. The detail resolution is unimpaired. Thus, a picture of a blue or red object (there are usually more green pixels) will tend to look fuzzy compared to the same object in shades of grey. See [1] (http://megamyth.homestead.com/imageres.html) for a more detailed discussion.
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