interp(6D)

NAME
     interp - gamma-corrected color ramp generator

SYNOPSIS
     /usr/demos/bin/interp

DESCRIPTION
     Interp makes smooth color ranges.  Two color chips and a Gouraud-shaded
     polygon showing the shade range between them are displayed.  To make a
     color range, start windows for showmap, cedit, and interp.  Select the
     color at the lower (usually darker) end of the shade range and use cedit
     to set it to the desired value.  Select the color at the top of the shade
     range and edit it as well.

     Now attach to (select) interp.  Point to the lower color (usually on
     showmap).  Press and release the left mouse button.  Point to the high
     color and repeat.  Both the extreme colors of your desired color ramp
     should be in the two large color chips in the interp window.  If you
     should make an error when selecting the extreme colors for your ramp,
     just keep trying to use the left mouse button to pick the colors, until
     the two color chips show the proper extreme color indices.

     When the extreme color indices are correctly chosen (which is reflected
     in the color chips), the other colors of the ramp can be interpolated.
     While interp is still selected for input, press and release the middle
     mouse button.  This interpolates all the colors between the extreme
     colors.

     The resultant color array will be gamma-corrected using the floating-
     point constant in ~/.gamma.  If no such file exists, the gamma constant
     is 1.0.

BUGS
     This program must have input focus in order to work properly.  See the
     window manager documentation for a discussion of input focus.