Do you mean:
using (Graphics g = Graphics.FromImage(pb.Image))
{
using(Brush brush = new SolidBrush(your_color))
{
g.FillRectangle(brush , x, y, width, height);
}
}
or you can use
Brush brush = new SolidBrush(Color.FromArgb(alpha, red, green, blue))
where alpha goes from 0 to 255, so a value of 128 for your alpha will give you 50%
opactity.
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