将图像转换为灰度 [英] Convert an image to grayscale

问题描述

有没有办法将图像灰度每比特的格式16像素，而不是各R，G和B分量的设置亮度转换。我现在有从文件BMP。

 位图C =新位图（文件名）;
 

我要一个位图D，这是C的灰度版本。我看到一个构造函数，包括System.Drawing.Imaging.PixelFormat，但我不知道如何使用它。我是新的图像处理和相关的C＃库，但有一个适度的经验C＃本身。

任何帮助，参考在线来源，提示或建议将AP preciated。

感谢您。

编辑：d为C的灰度版本

。

解决方案

  

我希望有一个位图D，这是灰度。
  我确实看到了consructor包括
  System.Drawing.Imaging.PixelFormat，
  但我不知道如何使用
  该

下面是如何做到这一点。

 位图grayScaleBP =新
         System.Drawing.Bitmap（2，2，System.Drawing.Imaging.PixelFormat.Format16bppGrayScale）;
 

编辑：：要转换为灰度

 位图C =新位图（FROMFILE）;
             位图D组;
             INT X，Y;             //循环遍历图像的像素重置颜色。
             为（X = 0; X＆下; c.Width; X ++）
             {
                 对于（Y = 0; Y＆LT; c.Height; Y ++）
                 {
                     色pixelColor = c.GetPixel（X，Y）;
                     色newColor = Color.FromArgb（pixelColor.R，0，0）;
                     c.SetPixel（X，Y，newColor）; //现在灰阶
                 }
             }
            D = C： // d为的C灰度版本
 

从<更快版本href=\"http://www.switchonthe$c$c.com/tutorials/csharp-tutorial-convert-a-color-image-to-grayscale\">switchonthe$c$c遵循链接，全面分析：

 公共静态位图MakeGrayscale3（位图原）
{
   //创建一个空白的位图的大小相同的原
   位图newBitmap =新位图（original.Width，original.Height）;   //获取图形从新Image对象
   图形G = Graphics.FromImage（newBitmap）;   //创建灰度嘉洛斯
   嘉洛斯嘉洛斯=新嘉洛斯（
      新的浮动[] []
      {
         新的浮动[] {.3f，.3f，.3f，0，0}，
         新的浮动[] {.59f，.59f，.59f，0，0}，
         新的浮动[] {.11f，.11f，.11f，0，0}，
         新浮[] {0，0，0，1，0}，
         新浮[] {0，0，0，0，1}
      }）;   //创建一些图像属性
   ImageAttributes属性=新ImageAttributes（）;   //设置色彩矩阵属性
   attributes.SetColorMatrix（嘉洛斯）;   //绘制新图像的原始图像
   //使用灰度色彩矩阵
   g.DrawImage（原件，新的Rectangle（0，0，original.Width，original.Height）
      0,0，original.Width，original.Height，GraphicsUnit.Pixel，属性）;   //处置Graphics对象
   g.Dispose（）;
   返回newBitmap;
}
 

Is there a way to convert an image to grayscale 16 pixels per bit format, rather than setting each of the r,g and b components to luminance. I currently have a bmp from file.

Bitmap c = new Bitmap("filename");

I want a Bitmap d, that is grayscale version of c. I do see a constructor that includes System.Drawing.Imaging.PixelFormat, but I don't understand how to use that. I'm new to Image Processing and the relevant C# libraries, but have a moderate experience with C# itself.

Any help, reference to an online source, hint or suggestion will be appreciated.

Thank you.

EDIT: d is the grayscale version of c.

解决方案

"I want a Bitmap d, that is grayscale. I do see a consructor that includes System.Drawing.Imaging.PixelFormat, but I don't understand how to use that."

Here is how to do this

Bitmap grayScaleBP = new 
         System.Drawing.Bitmap(2, 2, System.Drawing.Imaging.PixelFormat.Format16bppGrayScale);

EDIT: To convert to grayscale

             Bitmap c = new Bitmap("fromFile");
             Bitmap d;
             int x, y;

             // Loop through the images pixels to reset color.
             for (x = 0; x < c.Width; x++)
             {
                 for (y = 0; y < c.Height; y++)
                 {
                     Color pixelColor = c.GetPixel(x, y);
                     Color newColor = Color.FromArgb(pixelColor.R, 0, 0);
                     c.SetPixel(x, y, newColor); // Now greyscale
                 }
             }
            d = c;   // d is grayscale version of c  

Faster Version from switchonthecode follow link for full analysis:

public static Bitmap MakeGrayscale3(Bitmap original)
{
   //create a blank bitmap the same size as original
   Bitmap newBitmap = new Bitmap(original.Width, original.Height);

   //get a graphics object from the new image
   Graphics g = Graphics.FromImage(newBitmap);

   //create the grayscale ColorMatrix
   ColorMatrix colorMatrix = new ColorMatrix(
      new float[][] 
      {
         new float[] {.3f, .3f, .3f, 0, 0},
         new float[] {.59f, .59f, .59f, 0, 0},
         new float[] {.11f, .11f, .11f, 0, 0},
         new float[] {0, 0, 0, 1, 0},
         new float[] {0, 0, 0, 0, 1}
      });

   //create some image attributes
   ImageAttributes attributes = new ImageAttributes();

   //set the color matrix attribute
   attributes.SetColorMatrix(colorMatrix);

   //draw the original image on the new image
   //using the grayscale color matrix
   g.DrawImage(original, new Rectangle(0, 0, original.Width, original.Height),
      0, 0, original.Width, original.Height, GraphicsUnit.Pixel, attributes);

   //dispose the Graphics object
   g.Dispose();
   return newBitmap;
}

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