title: how to change size of picture using openpyxl
body: <p>there.
  I want to change size of picture using openpyxl.
  width = 11.21 cm.
  height = 7.69 cm.</p>
  
  <p>or I want to change the size of picture same as the cell.</p>
  
  <p>my code is below. it makes very small size picture.
  could you help me?</p>
  
  <pre><code>from openpyxl import load_workbook
  from openpyxl.drawing.image import Image
  
  filename="1.xlsx"
  wb = load_workbook(filename)
  ws = wb.worksheets[0]
  img = Image('13.5.jpg')
  img.width = 11.21
  img.height = 7.69
  ws.add_image(img, 'B13')
  wb.save('1.xlsx')
  print("done")
  </code></pre>