rgb(X)

rgb -- color database compiler

Syntax

rgb [database_name] < color_text_file

Description

The rgb program compiles a color database for the X server. color_text_file is the pathname of the text file that describes the names and RGB values for the colors the Xserver will recognize. Usually, /usr/lib/X11/rgb.txt is used as the color text file. If database_name is omitted, rgb generates two database files, /usr/lib/X11/rgb.dir and /usr/lib/X11/rgb.pag. If these two datafiles already exist, rgb checks the inputfile rgb.txt for colors that are not yet stored in the datafiles and appends these colors to rgb.dir and rgb.pag.

Options

database_name is an alternative database name that can include a path. If database_name is specified, database_name.dir and database_name.pag are used instead of the default color database files, /usr/lib/X11/rgb.dir and /usr/lib/X11/rgb.pag.

Color database files store the names of colors available to the X server and the corresponding RGB values. By default the X server, Xsco, reads /usr/lib/X11/rgb.dir and rgb.pag. If you run rgb with the database_name option, to create an alternative color database, you must instruct the server to read the alternative database files by running Xsco with the -fr option. Most SCO OpenServer systems start Xsco from the startx script, but you can pass the -fr option to Xsco through with the following command line:

startx -- -fr database_name

Color text file format

Each line of the color_text_file file consists of three color values and a color name. The color values are decimal numbers from 0 to 255 for the red, green, and blue (``RGB'') components of the color. The following is a typical entry:

   	35    35    142     Navy Blue

This entry defines ``Navy Blue'' as consisting of 35/255ths of the maximum possible intensity of red, 35/255ths of the maximum possible intensity of green, and 142/255ths of the maximum possible intensity of blue. The server is case-insensitive when searching for color names, so ``navy blue'' or ``Navy BLUE'' finds the entry above, for example. The server is sensitive to spaces in color names, so it does not equate ``Navy BLUE'' and ``NavyBLUE.''

Remember that the exact same color values may not produce the exact same shade of that color on different graphics adapters or monitors.

To activate changes to rgb.txt, you must recompile the color database with rgb and restart the server.

Files