
@C1@c@b@_ Intensity Along a Line

     Report pixel intensities along a line as 4 xy-plots with the horizontal
     axes being the distance, in pixels, along the line and vertical axes as
     the RGB intensities and luminosity (or color index in colormap mode)

@b Interaction
    The line that defines the path can be manipulated using mouse and/or
    keyboard. Use leftmouse and middlemouse to drag the two crosses on
    the two ends of the line to change its length and direction. The origin
    of the line is marked by a circle on the cross. Other commands are
    summarized as follows:
@b  KeyBoard
@i   Escape
     Quit Crop
@i   ijkl
     Same meaning as in vi. The end these keys apply to is the last one
     dragged by the mouse. Shift key can be used to override this behavior.
     See Help on Crop for details.
@b  menubutton
     The following items are available from pop-up menu
@i   Help
     For this help.
@i   LColor:
     change the line  color.
@i   Return:
     Exit measuring mode

@b  Reporting
     Current line length and origin (marked by a circle) are reported in
     the file panel as well as the angle the line makes with the horizon-
     tal direction.

     To get or update the intensity along current line, click the mouse
     outside the cross area.

@s@b Note
     This one still needs a lot of work.

