英文字典中文字典51ZiDian.com
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bitmap 位图,点阵图 位图,点阵图 bitmap 位元组列 bitmap 位元映像 bitmap n 1: an image represented as a two dimensional array of brightness values for pixels [synonym: {bitmap}, {electronic image}] corresponds {bit} for bit with an {image} displayed on a screen, probably in the same format as it would be stored in the display's {video memory} or maybe as a {device independent bitmap}. A bitmap is characterised by the width and height of the image in {pixels} and the number of bits per pixel which determines the number of shades of grey or colours it can represent. A bitmap representing a coloured image (a "{pixmap}") will usually have pixels with between one and eight bits for each of the red, green, and blue components, though other colour encodings are also used. The green component sometimes has more bits that the other two to cater for the human eye's greater discrimination in this component. See also {vector graphics}, {image formats}. (1996-09-21)
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