title: Methods for deleting blank (or nearly blank) pages from TIFF files
body: <p>I have something like 40 million TIFF documents, all 1-bit single page duplex.  In about 40% of cases, the back image of these TIFFs is 'blank' and I'd like to remove them before I do a load to a CMS to reduce space requirements.</p>
  
  <p>Is there a simple method to look at the data content of each page and delete it if it falls under a preset threshold, say 2% 'black'?</p>
  
  <p>I'm technology agnostic on this one, but a C# solution would probably be the easiest to support.  Problem is, I've no image manipulation experience so don't really know where to start.</p>
  
  <p><strong>Edit to add:</strong> The images are old scans and so are 'dirty', so this is not expected to be an exact science.  The threshold would need to be set to avoid the chance of false positives.</p>