title: Bitmap file header size
body: <p>I'm a newbie in programming bmp files and i checked this web site to learn about bmp header..
  <a href="http://www.daubnet.com/en/file-format-bmp" rel="noreferrer">http://www.daubnet.com/en/file-format-bmp</a></p>
  
  <p>it seems that the header of a bmp file is 54 bytes.</p>
  
  <p>Using paint, i created a simple 10x10 image, and i saved it in 24 bits.
  so according to simple math, the file size should be 10*10*3 + 54 = 354 bytes. </p>
  
  <p>but hex editor and file explorer returned a size of 374 bytes. </p>
  
  <p>So i have a difference of 20 bytes, and i don't know why. </p>
  
  <p>could you tell me why please? </p>
  
  <p>thanks a lot!!</p>