private void contrastToolStripMenuItem_Click(object sender, EventArgs e)
{
Bitmap tempImage = source;
int contrastValue = Convert.ToInt32(Prompt.ShowDialog("Enter contrast value", "Contrast"));
result = new Bitmap(source.Width, source.Height); //initalize the image
ImageProcess.EqualisationColored(tempImage, ref source, ref result, contrastValue);
outputPic.Image = result;
}
