SetGamma Method (Single)
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ImageAttributes.SetGamma Method (Single)

Sets the gamma value for the default category.

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

public void SetGamma(
	float gamma
)

Parameters

gamma
Type: System.Single

The gamma correction value.

Typical values for the gamma parameter are from 1.0 to 2.2; however, values from 0.1 to 5.0 could prove useful in some circumstances.

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

Gamma values outside the usual range may be useful for old CRT monitors or for monitors that are in unusual lighting conditions, such as industrial environments or window displays.

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

  1. Opens an Image that uses the file Camera.jpg and draws it to the screen using the default value for gamma.

  2. Creates an ImageAttributes object and sets its gamma to 2.2 by calling the SetGamma method.

  3. Draws the image (a second camera) to the screen using the gamma value just set in the ImageAttributes object.

private void SetGammaExample(PaintEventArgs e)
{

    // Create an Image object from the file Camera.jpg, and draw it to 
    // the screen.
    Image myImage = Image.FromFile("Camera.jpg");
    e.Graphics.DrawImage(myImage, 20, 20);

    // Create an ImageAttributes object and set the gamma to 2.2.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(2.2f);

    // Draw the image with gamma set to 2.2.
    Rectangle rect = new Rectangle(250, 20, 200, 200);
    e.Graphics.DrawImage(myImage, rect, 0, 0, 200, 200, 
        GraphicsUnit.Pixel, imageAttr);    
}

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

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