如何规范化图像？ [英] How do I normalize an image?

问题描述

如果我有一系列像素，范围从-500到+1000，我如何规范化同一渐变上的所有像素，使它们落在特定范围之间，比如0到255？

If I have a series of pixels, which range from say -500 to +1000, how would I normalize all the pixels on the same gradient so that they fall between a specific range, say 0 and 255?

推荐答案

像这样的伪代码会将值从一个范围线性扩展到另一个范围

Some pseudocode like this would scale values linearly from one range to another

oldmin=-500
oldmax=1000
oldrange=oldmax-oldmin;

newmin=0
newmax=255;
newrange=newmax-newmin;

foreach(oldvalue)
{
    //where in the old scale is this value (0...1)
    scale=(oldvalue-oldmin)/oldrange;

    //place this scale in the new range
    newvalue=(newrange*scale)+newmin
}

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