这将是一个很好的TRUE黑白嘉洛斯？ [英] What would be a good TRUE black and white colormatrix?

问题描述

我要的图像从彩色转换到B / W（即无灰度，只有黑和白）。有没有人有一个良好的嘉洛斯实现这个

I want to convert an image from color to B/W (i.e. no grayscale, just black and white). Does anyone have a good colormatrix to achieve this?

推荐答案

我终于找到我的问题的解决方案：

I've finally found a solution to my problem:

1. 变换为灰度图像，利用公已知嘉洛斯。


2. 使用的 SetThreshold 的方法在 ImageAttributes 类设置用于分隔白底黑字的门槛。

1. Transform the image to grayscale, using well a known colormatrix.
2. Use SetThreshold method of the ImageAttributes class to set the threshold that separates black from white.

下面是C＃代码

using (Graphics gr = Graphics.FromImage(SourceImage)) // SourceImage is a Bitmap object
        {                
            var gray_matrix = new float[][] { 
                new float[] { 0.299f, 0.299f, 0.299f, 0, 0 }, 
                new float[] { 0.587f, 0.587f, 0.587f, 0, 0 }, 
                new float[] { 0.114f, 0.114f, 0.114f, 0, 0 }, 
                new float[] { 0,      0,      0,      1, 0 }, 
                new float[] { 0,      0,      0,      0, 1 } 
            };

            var ia = new System.Drawing.Imaging.ImageAttributes();
            ia.SetColorMatrix(new System.Drawing.Imaging.ColorMatrix(gray_matrix));
            ia.SetThreshold(0.8); // Change this threshold as needed
            var rc = new Rectangle(0, 0, SourceImage.Width, SourceImage.Height);
            gr.DrawImage(SourceImage, rc, 0, 0, SourceImage.Width, SourceImage.Height, GraphicsUnit.Pixel, ia);                
        }

我这个基准测试代码，它是由比像素约快40倍像素处理。

I've benchmarked this code and it is approximately 40 times faster than pixel by pixel manipulation.

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