LOADCT

The LOADCT procedure loads one of 41 predefined IDL color tables. These color tables are defined in the file


colors1.tbl

(located in the main IDL directory) unless the FILE keyword is specified. The selected colortable is loaded into the COLORS common block as both the "current" and "original" colortable. If the current device has fewer than 256 colors, the color table data is interpolated to cover the number of colors in the device.

This routine is written in the IDL language. Its source code can be found in the file


loadct.pro

in the

lib

subdirectory of the IDL distribution.

Arguments

Table

The number of the pre-defined color table to load, from 0 to 40. If this value is omitted, a menu of the available tables is printed and the user is prompted to enter a table number.

Keywords

BOTTOM

The first color index to use. LOADCT will use color indices from BOTTOM to BOTTOM+NCOLORS-1. The default is BOTTOM=0.

FILE

Set this keyword to the name of a colortable file to be used instead of the file colors1.tbl in the IDL directory. The procedure (page ) can be used to create and modify colortable files.

GET_NAMES

Set this keyword to a named variable in which the names of the color tables are returned as a string array. No changes are made to the color table.

NCOLORS

The number of colors to use. The default is all available colors (this number is stored in the system variable !D.TABLE_SIZE).

SILENT

If this keyword is set, the Color Table message is suppressed.