什么是像素如何计算(国外英文资料).doc

什么是像素如何计算(国外英文资料) What is a pixel? How to calculate? Pixels (Pixel) is a Picture (image) and Element (Element) of the two words of letters, is used to calculate a kind of digital imaging unit, like photography photos, digital imaging and continuity of shade order, if we have several times to enlarge the image, will find that these continuous tone is actually composed of many small square points of similar color, these small parties point is the smallest unit of image pixels (Pixel). The smallest graphic unit can be displayed on the screen, usually a single dye. The more high the pixels, the more colorful the palette, the more realistic the color. A pixel is usually considered as the smallest complete sampling of the image. This definition is relevant to the context. We can say, for example, in a visible image pixels (such as a printed page) or expressed in electronic signal pixels, or expressed in digital pixels, or display pixels, or a digital camera (photosensitive element) in pixels. This list can also add a lot of other examples, according to the context, there will be some more accurate synonyms, such as drawing, sample point, bytes and bits, spot, spot, superset, triple junction, stripe set, the window, and so on. We can also talk abstractly about pixels, especially when using pixels as a resolution measure, such as 2400 pixels per inch (ppi) or 640 pixels per line. Points are sometimes used to represent pixels, especially computer marketers, so ppi is sometimes written as DPI (dots per inch). The more pixels you use to represent an image, the result is closer to the original image. The number of pixels in an image is sometimes referred to as image resolution, although the resolution has a more specific definition. Pixels can be expressed in a number, such as a 3 million pixel digital camera, it has a rating of three million pixels, or with a pair of Numbers, said 640 times 480 display , for example, it has 640 pixels on lateral and longitude 480 pixels (like