title: Floodfill in objective c
body: <p>I am trying for a coloring app and to figure out floodfill in objective c anybody did this before..???I am reading all pixel data in a picture and i can change it also..but floodfill can only do what i want exactly.. <img src="https://i.stack.imgur.com/C6pRE.png" alt="Sample Image">..Here I Can identify the pixels containing black dot also.but I am really confuse how to identify the pixels in a particular white area.Any help is appreciated..</p>