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CCD is the short form of Charge Coupled Device. It is the main device to capture the images. It is a light sensor that sits behind the lens in digital cameras. It records the image when you take a photograph. It is a grid made up of millions of tiny light sensors. The capacity of the CCD is measured in megapixels. The higher the number of megapixels the higher the resolution of the picture would be.
The big picture size is captured with the higher megapixels. The megapixles are also responsible for good print It depends on just how pin sharp you want the image. Two megapixel digital cameras will produce very good 6x4 prints, but if you are looking for exceptional quality then you will be better off looking at 3 megapixel digital cameras. Likewise with 8x11 prints. Three megapixel digital cameras will produce very good prints, but if you are looking for exceptional quality then you need to step up to 4 megapixel digital cameras.
Not all the pixels that are on a digital camera's CCD can be used when the photograph is taken. Some fall outside the range of the lens and some are painted black to help with colour balance. Therefore it is the number of effective pixels that people need to look out for when buying digital cameras.
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