Look--up tables or LUTs are the tables that map the data in the image memory
into colours on the display when the system is used in pseudo--colour mode.
In contrast to hardware display systems, the size of the LUT is
not constant but
depends upon how many colours are already used by other X applications
running already.
Commands exist to load LUTs into the image display, to modify the LUTs
interactively and to read back LUTs from the image display.
Some of the existing LUTs are:
backgr
color
heat
light
pastel
pseudo1, pseudo2
rainbow, rainbow1 ... rainbow4
random, random1 ... random4
smooth
staircase
stairs8
Use the command TUTORIAL/LUT to see how some of the available LUTs
actually look like and how to modify a LUT interactively.
The main commands available for handling LUTs are:
LOAD/LUT - load a look--up table
GET/LUT - read back a look--up table
MODIFY/LUT - interactively modify a look--up table
CLEAR/LUT - bypass the look--up table
SET/LUT - pass through a look--up table
DISPLAY/LUT - show the look--up table as a colour bar
CREATE/LUT - create a look--up table using the HSI colour model
Commands like MODIFY/LUT need a displacement.
Use the Arrow keys to move left, right and down (to thin) or
up (to thicken) a colour bar.
Again the speed of the movements is controlled via the keys 0, 1, ..., 9.