ImageAttributes Class
Contains information about how bitmap and metafile colors are manipulated during rendering.
Assembly: System.Drawing (in System.Drawing.dll)
An ImageAttributes object maintains several color-adjustment settings, including color-adjustment matrices, grayscale-adjustment matrices, gamma-correction values, color-map tables, and color-threshold values. During rendering, colors can be corrected, darkened, lightened, and removed. To apply such manipulations, initialize an ImageAttributes object and pass the path of that ImageAttributes object (along with the path of an Image) to the DrawImage method.
The following example takes an image that is all one color (0.2, 0.0, 0.4, 1.0) and doubles the red component adds 0.2 to the red, green, and blue components
The following illustration shows the original image on the left and the transformed image on the right.

The code in the following example uses the following steps to perform the recoloring:
Initialize a ColorMatrix object.
Create an ImageAttributes object and pass the ColorMatrix object to the SetColorMatrix method of the ImageAttributes object.
Pass the ImageAttributes object to the DrawImage method of a Graphics object.
Dim image As New Bitmap("InputColor.bmp") Dim imageAttributes As New ImageAttributes() Dim width As Integer = image.Width Dim height As Integer = image.Height ' The following matrix consists of the following transformations: ' red scaling factor of 2 ' green scaling factor of 1 ' blue scaling factor of 1 ' alpha scaling factor of 1 ' three translations of 0.2 Dim colorMatrixElements As Single()() = { _ New Single() {2, 0, 0, 0, 0}, _ New Single() {0, 1, 0, 0, 0}, _ New Single() {0, 0, 1, 0, 0}, _ New Single() {0, 0, 0, 1, 0}, _ New Single() {0.2F, 0.2F, 0.2F, 0, 1}} Dim colorMatrix As New ColorMatrix(colorMatrixElements) imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap) e.Graphics.DrawImage(image, 10, 10) e.Graphics.DrawImage( _ image, _ New Rectangle(120, 10, width, height), _ 0, _ 0, _ width, _ height, _ GraphicsUnit.Pixel, _ imageAttributes)
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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.