如何创造棕褐色调？ [英] How is a sepia tone created?

问题描述

创建棕褐色调需要哪些基本操作？我的参考点是perl imagemagick库，所以我可以轻松使用任何基本操作。我试图量化（使其灰度），着色，然后增强图像，但它仍然有点模糊。

What are the basic operations needed to create a sepia tone? My reference point is the perl imagemagick library, so I can easily use any basic operation. I've tried to quantize (making it grayscale), colorize, and then enhance the image but it's still a bit blurry.

推荐答案

我在这里的回答中提供了C＃中的棕褐色转换器的示例代码：这种棕褐色调转换算法有什么问题？

Sample code of a sepia converter in C# is available in my answer here: What is wrong with this sepia tone conversion algorithm?

该算法来自此页面，每个输入像素颜色按以下方式转换：

The algorithm comes from this page, each input pixel color is transformed in the following way:

outputRed = (inputRed * .393) + (inputGreen *.769) + (inputBlue * .189)
outputGreen = (inputRed * .349) + (inputGreen *.686) + (inputBlue * .168)
outputBlue = (inputRed * .272) + (inputGreen *.534) + (inputBlue * .131)

如果有的话这些输出值大于255，你只需将它设置为
到255.这些特定值是微软推荐的棕褐色调值，
。

If any of these output values is greater than 255, you simply set it to 255. These specific values are the values for sepia tone that are recommended by Microsoft.

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