Cross Plot Tool

Plots the pixel values of two images against each other.
Allows selection of pixels in a rectangular area of the
cross plot and display of these pixels as a bit mask.

Select two source windows by entering the window numbers
in the areas labeled "x image" and "y image". Also select
windows to use for the cross plot and the bit mask. Press
the "plot" button to make the cross plot. Each dot plotted
represents the value of a pixel in the two images as an
(x,y) point. The "select" button then allows a rectangle
to be interactively drawn on this cross plot. To define a
rectangle, first press "select" then move the mouse
(buttons up) to the cross plot near where you want to define
one corner of the rectangle. Press and hold the left or
middle button and drag the mouse to expand the rectangle.
You can also shift the entire rectangle by holding the shift
key as well but don't release the mouse until you are happy
with tha shape and position of the rectangle. All the pixels
having (x,y) coordinates in the selected rectangle can be
displayed as a bit mask now by pressing the mask key.

To get rid of this window, press help again. To get
rid of the superpose tool window and this window,
press dismiss.