ht of the image in number of pixels)</span></span></td></tr>
<tr class=b>
<td>ImageWidth</td>
<td class=c>N</td>
<td class=c>File</td>
<td><span class=s><span class=n>(the width of the image in number of pixels)</span></span></td></tr>
<tr>
<td>JPEGDigest</td>
<td class=c>N</td>
<td class=c>File</td>
<td><span class=s><span class=n>(an MD5 digest of the JPEG quantization tables is combined with the component
sub-sampling values to generate the value of this tag.  The result is
compared to known values in an