What is a Megapixel?
A Megapixel is 1 million pixels. Each pixel is a single "picture element" or dot on a display screen. An image 1200 pixels wide by 900 pixels high would be about 1 megapixel.Digital cameras and cameras on cell phones are rated in terms of megapixels. The megapixel rating of a camera describes how many pixels are captured in a single digital picture. The more pixels that a camera can capture, the higher the image resolution of the resulting image and further you can enlarge the image without pixelation.
Image resolution (megapixels) is only one factor that determines the quality of digital pictures that can be produced by a digital camera. The optics and dynamic range of the image sensor are also important factors. For most people, images that are a few megapixels in size are adequate for viewing on a computer screen or making small prints. If you want to zoom in or produce large prints, you could benefit from a higher resolution camera with 10 Megapixels or more.
File Size per Megapixel
You can use settings on a digital camera to reduce the number of pixels that are captured if you do not want to store large files for each image. For example, an uncompressed 1 megapixel image requires about 1.5 megabytes (Mb) of storage space. If compression such as JPEG is used, the files size is typically reduced by about half. If you take 10 megapixel images, each one will require about 15Mb of storage space (7.5 Mb if compressed)The top selling digital SLR Camera on amazon has a 18 Megapixel sensor.
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