New Post: Invert Image colors

Hi,

I want to implement a function to can invert colors for readability on a small screen. I came across some code that works for me, but i don't know where to implement this the right way, so i can stil use page/zoom etc.

public Bitmap Transform(Bitmap source)
{

//create a blank bitmap the same size as original
Bitmap newBitmap = new Bitmap(source.Width, source.Height);

//get a graphics object from the new image
Graphics g = Graphics.FromImage(newBitmap);

// create the negative color matrix
ColorMatrix colorMatrix = new ColorMatrix(new float[][]
{
    new float[] {-1, 0, 0, 0, 0},
    new float[] {0, -1, 0, 0, 0},
    new float[] {0, 0, -1, 0, 0},
    new float[] {0, 0, 0, 1, 0},
    new float[] {1, 1, 1, 0, 1}
}); 

// create some image attributes
ImageAttributes attributes = new ImageAttributes();

attributes.SetColorMatrix(colorMatrix);

g.DrawImage(source, new Rectangle(0, 0, source.Width, source.Height),
            0, 0, source.Width, source.Height, GraphicsUnit.Pixel, attributes);

//dispose the Graphics object
g.Dispose();

return newBitmap;

}