Makes a new image from part of an image.
graphics-ports
make-sub-image port image &optional x y width height => sub-image
port
A graphics port.
image
An image.
x
An integer.
y
width
height
sub-image
The function make-sub-image makes a new image object from the rectangular region of the supplied image specified by x , y , width and height .
make-sub-image
The default values of x and y are 0.
The default value of width is the width of image .
The default value of height is the height of image .