title: Crop the rectangle region from the image using imagemagick
body: <p>I have an image. I need to crop the rectangle region from the image. This rectangle region is identified by black color border. Inside the rectangle is what I need. Is it possible to crop the black color bordered rectangle region in imagemagick? I know it could be possible using crop command by providing offset(-crop WxH+X+Y) of the rectangle region. But I want to crop the rectangle region without manually measuring the upper left and lower right corners of the rectangle. Is it possible to crop the rectangle region using black color border alone...??? </p>