|Before coming to ImageMagick visit Poor Person's Image Mapper and find the top left and lower right coordinates of the area you want to cut out.|
Next you'll need to know the size of the area you want
to cut out. Take the coordinates you got at the Image Mapper and subtract the upper left
coordinates from the lower right coordinates. (lower
width - upper width) & (lower height - upper
height) Width of cut Height of cut
These coordinates will be used to cut out your image.
Enter the coordinates as follows: