Returns a subimage defined by a specified rectangular region. The returned BufferedImage shares the same data array as the original image.

Parameters:

x		the X coordinate of the upper-left corner of the specified rectangular region
y		the Y coordinate of the upper-left corner of the specified rectangular region
w		the width of the specified rectangular region
h		the height of the specified rectangular region

Returns:  a BufferedImage that is the subimage of this BufferedImage.

Exceptions:

RasterFormatException

if the specified area is not contained within this BufferedImage.