New Post: How to draw a transparent rectangle at a specific location, on a specific image?

privatestatic MagickImage ApplyWatermark(MagickImage image, string waterMarkText) {
    var backgroundOfWaterMark = new MagickImage(new MagickColor("#FFFFFF"), image.Width, 20) { Format = MagickFormat.Png };
    var img = image;
    img.Composite(backgroundOfWaterMark, 0, img.Height - 20);
    img.Format = MagickFormat.Png;
    var font = new DrawableFont("Batang");
    var text = new DrawableText(3, img.Height - 7, waterMarkText);
    var size = new DrawablePointSize(13);
    var fillColor = new DrawableFillColor(new MagickColor("#000000"));
    image.Draw(font, size, fillColor, text);
    backgroundOfWaterMark.Dispose();
    image.Dispose();
    font.Dispose();
    text.Dispose();
    size.Dispose();
    fillColor.Dispose();
    return img;
}