title: Remove transparency in images with C#
body: <p>does anyone know a smooth / fast way of removing transparency from e.g. pngs/tiffs etc and replacing it with a white background?</p>
  
  <p>Basically what I need this for is I need to create PDF/A compatible images, which may, according to the spec, have -no- transparency (and therefore a fixed white background is fine).</p>
  
  <p>Any ideas / suggestions?</p>
  
  <p>Cheers &amp; thanks,
  -Jörg</p>