/*
Copyright (c) 2010 <a href="http://www.gutgames.com">James Craig</a>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.*/
#region Usings
using System.Drawing;
using System.Drawing.Imaging;
#endregion
namespace Utilities.Media.Image
{
/// <summary>
/// Helper class for setting up and applying a color matrix
/// </summary>
public class ColorMatrix
{
#region Constructor
/// <summary>
/// Constructor
/// </summary>
public ColorMatrix()
{
}
#endregion
#region Properties
/// <summary>
/// Matrix containing the values of the ColorMatrix
/// </summary>
public float[][] Matrix { get; set; }
#endregion
#region Public Functions
/// <summary>
/// Applies the color matrix
/// </summary>
/// <param name="OriginalImage">Image sent in</param>
/// <returns>An image with the color matrix applied</returns>
public Bitmap Apply(Bitmap OriginalImage)
{
using (Graphics NewGraphics = Graphics.FromImage(NewBitmap))
{
System.Drawing.Imaging.ColorMatrix NewColorMatrix = new System.Drawing.Imaging.ColorMatrix(Matrix);
using (ImageAttributes Attributes = new ImageAttributes())
{
Attributes.SetColorMatrix(NewColorMatrix);
NewGraphics.DrawImage(OriginalImage,
new System.Drawing.Rectangle(0, 0, OriginalImage.Width, OriginalImage.Height),
0, 0, OriginalImage.Width, OriginalImage.Height,
GraphicsUnit.Pixel,
Attributes);
}
}
return NewBitmap;
}
#endregion
}
}
/// <summary>
/// Converts an image to black and white
/// </summary>
/// <param name="Image">Image to change</param>
/// <returns>A bitmap object of the black and white image</returns>
public static Bitmap ConvertBlackAndWhite(Bitmap Image)
{
ColorMatrix TempMatrix = new ColorMatrix();
TempMatrix.Matrix = 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}
};
return TempMatrix.Apply(Image);
}
float[][] FloatColorMatrix ={
new float[] {1, 0, 0, 0, 0},
new float[] {0, 1, 0, 0, 0},
new float[] {0, 0, 1, 0, 0},
new float[] {0, 0, 0, 1, 0},
new float[] {0, 0, 0, 0, 1}
};
您可以使用ImageMagick来实现这个功能。可以通过命令行运行Process.Start，或者使用作为Windows安装的一部分的COM接口。选项“-monochrome”是您的好帮手。
了解一下 Floyd-Steinberg 抖动算法：http://en.wikipedia.org/wiki/Floyd%E2%80%93Steinberg_dithering
或者，如果您不需要抖动，可以找到平均亮度并将所有像素设置为高于该值的白色和低于该值的黑色。
Chuck Conway发布的解决方案的工作版本
/*
Copyright (c) 2010 <a href="http://www.gutgames.com">James Craig</a>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.*/
using System.Drawing;
using System.Drawing.Imaging;
namespace WebCamService {
class ColorMatrix {
public float[][] Matrix { get; set; }
public Bitmap Apply(Bitmap OriginalImage) {
using (Graphics NewGraphics = Graphics.FromImage(OriginalImage)) {
System.Drawing.Imaging.ColorMatrix NewColorMatrix = new System.Drawing.Imaging.ColorMatrix(Matrix);
using (ImageAttributes Attributes = new ImageAttributes()) {
Attributes.SetColorMatrix(NewColorMatrix);
NewGraphics.DrawImage(OriginalImage,
new System.Drawing.Rectangle(0, 0, OriginalImage.Width, OriginalImage.Height),
0, 0, OriginalImage.Width, OriginalImage.Height,
GraphicsUnit.Pixel,
Attributes);
}
}
return OriginalImage;
}
public static Bitmap ConvertBlackAndWhite(Bitmap Image) {
ColorMatrix TempMatrix = new ColorMatrix();
TempMatrix.Matrix = 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}
};
return TempMatrix.Apply(Image);
}
}
}