title: What are best parameters to run ImageMagick to convert low quality pdf to images (for OCR)
body: <p>I have several low quality pdfs. I would like to use OCR -- to be more precise <a href="http://code.google.com/p/ocropus/" rel="noreferrer">Ocropus</a>  to get text from them. To do use, I use first <a href="http://www.imagemagick.org/script/command-line-options.php" rel="noreferrer">ImageMagick</a>  -- a command line tool to convert pdf to images -- to transforms these pdfs into jpg or png.</p>
  
  <p>However ImageMagick produces very low quality images and Ocropus hardly recognizes anything. I would like to learn what are the best parameters for handling low quality pdfs to provide as-good-as-possible-quality images to OCR.</p>
  
  <p>I have found <a href="http://www.imagemagick.org/script/command-line-options.php" rel="noreferrer">this page</a>, but I do not know where to start.</p>