C# ImageAttributes.SetColorMatrix方法代碼示例

private void SetColorMatrixExample(PaintEventArgs e)
{
             
    // Create a rectangle image with all colors set to 128 (medium
             
    // gray).
    Bitmap myBitmap = new Bitmap(50, 50, PixelFormat.Format32bppArgb);
    Graphics g = Graphics.FromImage(myBitmap);
    g.FillRectangle(new SolidBrush(Color.FromArgb(255, 128, 128, 128)),
        new Rectangle(0, 0, 50, 50));
    myBitmap.Save("Rectangle1.jpg");
             
    // Open an Image file and draw it to the screen.
    Image myImage = Image.FromFile("Rectangle1.jpg");
    e.Graphics.DrawImage(myImage, 20, 20);
             
    // Initialize the color matrix.
    ColorMatrix myColorMatrix = new ColorMatrix();
    
    // Red
    myColorMatrix.Matrix00 = 1.75f; 
    
    // Green
    myColorMatrix.Matrix11 = 1.00f; 
    
    // Blue
    myColorMatrix.Matrix22 = 1.00f; 
    
    // alpha
    myColorMatrix.Matrix33 = 1.00f; 
   
    // w
    myColorMatrix.Matrix44 = 1.00f; 

    // Create an ImageAttributes object and set the color matrix.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetColorMatrix(myColorMatrix);
             
    // Draw the image using the color matrix.
    Rectangle rect = new Rectangle(100, 20, 200, 200);
    e.Graphics.DrawImage(myImage, rect, 0, 0, 200, 200, 
        GraphicsUnit.Pixel, imageAttr);      
}

private void RotateColors(PaintEventArgs e)
{
    Bitmap image = new Bitmap("RotationInput.bmp");
    ImageAttributes imageAttributes = new ImageAttributes();
    int width = image.Width;
    int height = image.Height;
    float degrees = 60f;
    double r = degrees * System.Math.PI / 180; // degrees to radians

    float[][] colorMatrixElements = { 
        new float[] {(float)System.Math.Cos(r),  (float)System.Math.Sin(r),  0,  0, 0},
        new float[] {(float)-System.Math.Sin(r),  (float)-System.Math.Cos(r),  0,  0, 0},
        new float[] {0,  0,  2,  0, 0},
        new float[] {0,  0,  0,  1, 0},
        new float[] {0, 0, 0, 0, 1}};

    ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);

    imageAttributes.SetColorMatrix(
       colorMatrix,
       ColorMatrixFlag.Default,
       ColorAdjustType.Bitmap);

    e.Graphics.DrawImage(image, 10, 10, width, height);

    e.Graphics.DrawImage(
       image,
       new Rectangle(150, 10, width, height),  // destination rectangle 
        0, 0,        // upper-left corner of source rectangle 
        width,       // width of source rectangle
        height,      // height of source rectangle
        GraphicsUnit.Pixel,
       imageAttributes);
}

//引入命名空間
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Text;
using System.Drawing.Printing;
using System.Drawing.Drawing2D;
using System.Text;
using System.Windows.Forms;

public class Form1 : Form {

    protected override void OnPaint(PaintEventArgs e) {
        Bitmap bmp = new Bitmap("alphabet.gif");
        Graphics g = e.Graphics;

        float[][] matrixItems = {
                    new float[] {0.2f, 0, 0, 0, 0},
                    new float[] {0, 0.8f, 0, 0, 0},
                    new float[] {0, 0, 1, 0, 0},
                    new float[] {0, 0, 0, 1, 0}, 
                    new float[] {0, 0, 0, 0, 1}};
        ColorMatrix colorMatrix = new ColorMatrix(matrixItems);

        ImageAttributes imageAtt = new ImageAttributes();
        imageAtt.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);

        TextureBrush tb = new TextureBrush(bmp, new Rectangle(0, 0, bmp.Width, bmp.Height), imageAtt);
        tb.WrapMode = WrapMode.Tile;
        g.FillRectangle(tb, this.ClientRectangle);
        bmp.Dispose();
        tb.Dispose();
    }
    public static void Main() {
        Application.Run(new Form1());
    }
}