The resolution digital photography is measured by multiplying the height by the width of the photographs that allows for the camera and usually starts with one million pixels, for cheaper cameras, and rising to over ten million pixels, for professional cameras. The term “pixel” (English picture element) is the smallest unit that captures a gray value or color photography. A camera will generate four million pixel images larger than a two million, which allows for a printout of up to 50 x 75 cm, but not necessarily of higher quality since this aspect is of utmost importance to the quality of optics used. However, given that more megapixel cameras are more expensive, it is usually also have better lenses. Another feature of digital photography is the digital zoom. With this zoom you can enlarge a photo, but the effect is not an optical zoom.The optical zoom and wide about what you want to photograph without decreasing the resolution of the camera, as it gets closer to the goal. Digital zoom, on the contrary, enhances the picture that has already received, so that decreases the resolution, as it would be commissioning an extension to the laboratory or using a graphics ing program. Today digital cameras can also take videos, usually at resolutions of 320×240 or 640×480 pixels and between 12 and 60 frames per second, sometimes with sound (mono normal) for more complete models. These videos are only a supplement to the main function of the camera, take pictures, so not usually of great quality, this requires a camcorder.