title: Using the C API for ImageMagick (on iPhone?) to convert to monochrome?
body: <p>I am using the code referenced in <a href="https://stackoverflow.com/questions/6905794/imagemagick-monochrome-convert-in-iphone/6924107#6924107">this post</a>, but would like to switch to an ImageMagick C-API based solution, as I want to standardize on a single image manipulation library, and need IM for some other tasks.</p>
  
  <p>I can find tons of examples of using the convert command line tool, but none on how to do the monochrome conversion in code.</p>
  
  <p>Any sample code out there?</p>