Example 1: Using custom colors in default palettes
Let's assume you are an administrator for a system
whose X server and clients are accessed by several users.
Your users have asked you to replace
the window background color in the default, system-wide
palette called Northwoods
with a more muted shade of blue,
because the current color, as it displays on your
is too bright.
After some experimentation, you decide that none of
the shades of blue available in the database will satisfy
all of your users, so you create a custom color to
resolve the problem. This example covers all aspects
of incorporating this color into the
Northwoods palette, including how to:
add the custom color to the color database, and
add the color to the system-wide palette file.
The following steps result in a modified default palette:
Log into the system as root. If you did not
log into the root account through a scologin
window, start a Graphical Environment session
From a scoterm window,
change to the /usr/lib/X11 directory and open the
rgb.txt file for editing.
Because your new color is a shade of blue, locate the section
of the rgb.txt file that defines blue colors. This
section starts with the following entry:
25 25 112 midnight blue
Within the blue section, open a line and
enter the RGB values and the name for your custom color.
Color names are separated from the RGB values
by a tab.
For this example, enter:
184 216 255 alpine blue
Because the color name in this example
consists of two words, you should also enter the following:
184 216 255 Alpine Blue
Save and exit the rgb.txt file.
Recompile the color database with the rgb
command so the X server can recognize the new color:
rgb < rgb.txt
When your prompt returns, run the showrgb command
to check that the new color is now listed in the
showrgb | grep alpine
This command produces the definition line for the Alpine Blue
color. Remember to use lowercase letters when greping
for a color name with the showrgb client.
You are now ready to modify the
Northwoods palette and add
your new color. Change directories to
/usr/lib/X11/sco/ScoColor and look for the
file named palettes. This file
contains all of the system-wide palette definitions.
Make a backup copy of the palettes file, in case
you should want to return to the original
Northwoods palette some day:
cp palettes palettes.old
Open the palettes file for editing and
search for the
Northwoods palette definition. You should see:
172 199 224
52 0 0
255 241 241
158 228 151
16 86 124
255 238 255
255 220 180
255 148 48
The window background color is defined by the
Background color button. The color for this button
is specified in the second line of the
definition. Replace the second line, which reads
172 199 224, with the RGB values
for the new color, using tabs to separate the three
184 216 255
Save and exit the palettes file.
To verify that you correctly modified the
run the scocolor client and
Northwoods palette. You should see a much more
pleasing shade of blue for the backgrounds of your windows.
Example 2: Customizing colors with resources
Examples of changing colors
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003