In computer graphics, a raster graphics image or bitmap is a data structure representing a generally rectangular grid of pixels, or points of color, viewable via a monitor, paper, or other display medium. Raster images are stored in image files with varying formats。
在計算機圖形中，光柵圖形(raster graphics)圖像或點陣圖(bitmap)是一個資料結構較普遍矩形(rectangular)網格的像素()，或點顏色，通過可視監視器，紙或其他顯示介質。光柵圖像存儲在圖像文件(image files)具有不同的格式。
A bitmap corresponds bit-for-bit with an image displayed on a screen, generally in the same format used for storage in the display's video memory, or maybe as a device-independent bitmap. A bitmap is technically characterized by the width and height of the image in pixels and by the number of bits per pixel .一個點陣圖對應位元的位元圖像顯示在屏幕上，一般在使用相同的格式存儲在顯示器的視頻內存，或一個獨立設備的點陣圖。點陣圖的特點是技術上的寬度和高度的圖像像素和每像素多少位元。
The printing and prepress industries know raster graphics as contones (from "continuous tones") and refer to vector graphics as "line work".
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