Use a color matrix to change the color properties of the image

     

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());
    }
}

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Use a color matrix to change the color properties of the image : Bitmap « 2D Graphics « C# / C Sharp

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