SolidBrush semiTransparentBrush = new SolidBrush(Color.FromArgb(90, 255, 0, 0)); // 90 is the alpha value (range goes from 0 - completely transparent, 255 - solid) image.FillRectangle(semiTransparentBrush, 0, 0, image.Width, image.Height);
var
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