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ImageAttributes.SetColorMatrix Method (ColorMatrix, ColorMatrixFlag, ColorAdjustType)

Sets the color-adjustment matrix for a specified category.

Namespace:  System.Drawing.Imaging
Assembly:  System.Drawing (in System.Drawing.dll)

public void SetColorMatrix(
	ColorMatrix newColorMatrix,
	ColorMatrixFlag mode,
	ColorAdjustType type


Type: System.Drawing.Imaging.ColorMatrix

The color-adjustment matrix.

Type: System.Drawing.Imaging.ColorMatrixFlag

An element of ColorMatrixFlag that specifies the type of image and color that will be affected by the color-adjustment matrix.

Type: System.Drawing.Imaging.ColorAdjustType

An element of ColorAdjustType that specifies the category for which the color-adjustment matrix is set.

An ImageAttributes object maintains color and grayscale settings for five adjustment categories: default, bitmap, brush, pen, and text. For example, you can specify a color-adjustment matrix for the default category, a different color-adjustment matrix for the bitmap category, and still a different color-adjustment matrix for the pen category.

The default color-adjustment and grayscale-adjustment settings apply to all categories that do not have adjustment settings of their own. For example, if you never specify any adjustment settings for the pen category, the default settings apply to the pen category.

As soon as you specify a color-adjustment or grayscale-adjustment setting for a certain category, the default adjustment settings no longer apply to that category. For example, suppose you specify a collection of adjustment settings for the default category. If you set the color-adjustment matrix for the pen category by passing Pen to the SetColorMatrix method, none of the default adjustment settings will apply to pens.

The following code example demonstrates how to use the SetColorMatrix method. To run this example, paste the code into a Windows Form and call RotateColors from the form's Paint event-handling method, passing e as PaintEventArgs.

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);


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

       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


Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0