/// <summary>
/// Inverts the current composite image.
/// </summary>
private void mnuInvert_Click(object sender, EventArgs e)
{
addBackgroundOperation(
GraphicOperations.ApplyInvertFilter((Bitmap)pbxDisplay.Image),
"Applying invert filter",
(ps, pe) => { pbxDisplay.Image = (Bitmap)pe.Result; }
);
}