title: Convert a Bitmap to GrayScale in Android
body: <p>I am new to this site, and I come with a question about Android.</p>
  
  <p>Is there any way to convert a Bitmap to grayscale? I know how to draw a grayscale bitmap (using canvas operations: <a href="http://www.mail-archive.com/android-developers@googlegroups.com/msg38890.html" rel="noreferrer">http://www.mail-archive.com/android-developers@googlegroups.com/msg38890.html</a>) but I really need The actual bitmap in gray colors (or at least something that could be converted to a bitmap later on).
  Do I have to implement it by hand (pixel by pixel operations)?</p>
  
  <p>I've searched a lot, and still could not find. Anyone knows a easy/efficient way to do it?</p>
  
  <p>Thanks a lot!</p>