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What does image resolution mean?

Resolution refers to the number of pixels in an image. Resolution is sometimes identified by the width and height of the image as well as the total number of pixels in the image. For example, an image that is 2048 pixels wide and 1536 pixels high (2048 × 1536) contains 3,145,728 pixels (or 3.1 megapixels). You could call it a 2048 × 1536 or a 3.1-megapixel image. As the megapixels in the pickup device in your camera increase so does the possible maximum size image you can produce. This means that a 5-megapixel camera is capable of capturing a larger image than a 3-megapixel camera.