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Bitmap.MakeTransparent Method (Color)

Makes the specified color transparent for this Bitmap.

Namespace: System.Drawing
Assembly: System.Drawing (in system.drawing.dll)

public void MakeTransparent (
	Color transparentColor
public void MakeTransparent (
	Color transparentColor
public function MakeTransparent (
	transparentColor : Color
Not applicable.



The Color structure that represents the color to make transparent.

Exception typeCondition


The image format of the Bitmap is an icon format.


The operation failed.

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

  • Gets the color of a pixel in a Bitmap.

  • Makes that color transparent for the bitmap.

  • Draws the Bitmap to the screen.

private void MakeTransparent_Example2(PaintEventArgs e)
    // Create a Bitmap object from an image file.
    Bitmap myBitmap = new Bitmap("Grapes.gif");
    // Draw myBitmap to the screen.
        myBitmap, 0, 0, myBitmap.Width, myBitmap.Height);
    // Get the color of a background pixel.
    Color backColor = myBitmap.GetPixel(1, 1);
    // Make backColor transparent for myBitmap.
    // Draw the transparent bitmap to the screen.
        myBitmap, myBitmap.Width, 0, myBitmap.Width, myBitmap.Height);

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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0