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Date: Tue, 10 Dec 1996 03:31:46 GMTServer: NCSA/1.4.2Content-type: text/html<html><head> <title>Digital Images</title></head><body><img src=gif/digital.gif> <p><h1> <a name="top">Digital Images</a><br></h1><hr> <p>A digital image is a two-dimensional array of small square regions known aspixels. In the case of a monochrome (also known as gray-scale or"black-and-white" with shades ofgray) image, the brightness of each pixel isrepresented by a numeric value. Gray-scale images typically contain values inthe range from 0 to 255, with 0 representing black, 255representing white and values in between representing shades of gray. Here isan example of the above picture blown up to show the underlying pixel values.<p><img src=gif/dig_blow.gif> <p><p>A color image can be represented by a two-dimensionalarray of Red, Green and Bluetriples. Typically, each number in the triple also rangesfrom 0 to 255, where 0indicates that none of that primary color is present in that pixeland 255 indicates a maximum amount of that primary color.<body><p> <hr><address> bricker@cs.washington.edu or tanimoto@cs.washington.edu <br> Last modified: Tues Mar 8, 23:00:58 PST 1994</address></html>⌨️ 快捷键说明
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