title: A watermark inside a rectangle which filled the certain color
body: <p>I want to add a watermark at a picture. But just a text, but a rectangle filled with the black color and a white text inside it.</p>
  
  <p>For now, I only can put a text:</p>
  
  <pre><code>from PIL import Image
  from PIL import ImageFont
  from PIL import ImageDraw
  
  img = Image.open("in.jpg")
  
  draw = ImageDraw.Draw(img)
  font = ImageFont.truetype("/usr/share/fonts/truetype/ubuntu-font-family/Ubuntu-C.ttf", 66)
  #font = ImageFont.truetype("Arialbd.ttf", 66)
  draw.text((width - 510, height-100),"copyright",(209,239,8), font=font)
  img.save('out.jpg')
  </code></pre>