title: Getting Image size of JPEG from its binary
body: <p>I have a lot of jpeg files with varying image size. For instance, here is the first 640 bytes as given by hexdump of an image of size 256*384(pixels):</p>
  
  <pre><code>0000000: ffd8 ffe0 0010 4a46 4946 0001 0101 0048  ......JFIF.....H
  0000010: 0048 0000 ffdb 0043 0003 0202 0302 0203  .H.....C........
  0000020: 0303 0304 0303 0405 0805 0504 0405 0a07  ................
  0000030: 0706 080c 0a0c 0c0b 0a0b 0b0d 0e12 100d  ................
  </code></pre>
  
  <p>I guess the size information mus be within these lines. But am unable to see which bytes give the sizes correctly. Can anyone help me find the fields that contains the size information?</p>