title: PNG to Bitmap file conversion
body: <p>I'm developing a RESTful API with Spring where some users can upload some images they draw in a mobile device. The mobile application sends the image in .png format and I would need to generate a bitmap from it for further processing in Delphi. I've been playing around using <a href="http://docs.oracle.com/javase/7/docs/api/javax/imageio/ImageIO.html" rel="nofollow">ImageIO</a> class but it does not seem to do the trick when specifying .bmp format and writing to a new file. Are out there some libraries that do these kind of image conversions? It should be a solved problem nowadays but I am not familiar with image processing.</p>
  
  <p>Thanks</p>