The optional Text and Background Color feature is provided through the Color Button plugin which by default is available in the Full distribution.
When the plugin is enabled, theand buttons are automatically added to the toolbar. You can use them to add some color to your content. If you want to quickly remove colors from your document, use the button provided by the Remove Format plugin.
You can also add an optional Color Dialog plugin which provides the More Colors option and a user-friendly way to select the desired color through a dedicated dialog window. The editor instance below includes both features.
Allowing your users to use any colors they wish might lead to undesired results, i.e. joyfully colorful content
that will make your page look like it was created in the early 1990s. You can prevent this situation by customizing the
color list to only include a limited number of colors that match your website style. The editor instance below
option to trim down the color list to a selected few.
Additionally, since CKEditor 4.5.8 you can also disable the "Automatic" option by setting the
false. The editor instance below includes customizations.