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The LJLCT procedure loads standard color tables for LJ-250/252 printer. The color tables are modified on ly if the device is currently set to "LJ".
The default color maps used are for the 90 dpi color palette. There are only 8 colors available at 180 dpi.
If the current device is `LJ', the !D.N_COLORS system variable is used to determine how many bit planes are in use (1 to 4). The standard color map for that number of planes is loaded. These maps are described in Chapter 7 of the LJ250/LJ252 Companion Color Printer Programmer Reference Manual , Table 7-5. That manual gives the values scaled from 1 to 100, LJLCT scales them from 0 to 255.
This routine is written in the IDL language. Its source code can be found in the file
ljlct.pro
in the
lib
subdirectory of the IDL distribution.