Assistive Technologies

Contents

4.1. General Accessibility Features
4.2. Mobility Impairments
4.3. Orca

Abstract

The GNOME user interface incorporates many accessibility features and specially designed assistive technologies which contribute greatly to the accessibility of the GNOME desktop.

This chapter describes several assistive technology applications designed to meet the needs of users with physical disabilities such as low vision or impaired motor skills.

General Accessibility Features

A number of technologies can be of assistance to people with different types of disabilities. These are covered in this section.

Desktop Appearance Enhancement

There are several ways to customize the appearance of the GNOME desktop to suit your specific needs. Themes are the most effective way to change the appearance of the desktop in a consistent manner. You can also customize different components of the desktop to achieve the display settings that you require. You can configure the desktop and applications in addition to using themes or as an alternative to themes. For details, see Chapter 3, Customizing Your Settings.

Customizing Specific Components of the Desktop

This section describes how to customize the font settings for the desktop and frequently-used applications.

If you have difficulty with the default font type and size on the desktop and desktop background, you can customize the font settings to suit your needs.

The Appearance Preferences tool allows you to specify the default fonts for the desktop. To start the Appearance Preferences tool, choose System+ Control Center+Appearance. The Fonts tab contains the following options:

Application Font

Click on this button to select a default font to use for the text that is displayed on the desktop, including the text displayed on the windows and dialogs associated with GNOME-compliant applications.

Document Font

Click on this button to select a font to use for displaying documents.

Desktop Font

Click on this button to select a font to use for the text that is displayed on the desktop background only.

Window Title Font

Click on this button to select a font to use for the text that is displayed in the title bar area of windows.

Fixed Width Font

Click on this button to select a font to use for editing documents.

Font Rendering

To specify how to render fonts on the desktop select either:

  • Monochrome,

  • Best Shapes,

  • Best Contrast

  • or Subpixel Smoothing.

If you use large fonts, you may need to change the size of panes in some applications, such as the file manager and Help browser.

By default, GNOME applications use the default font specified in the Appearance Preference tool. Some applications allow this default font to be customized.

Customizing Desktop Contrast

To achieve a high-contrast or low-contrast desktop, perform the following steps:

  1. Use the Appearance Preference tool to select the high-contrast or low-contrast desktop theme that you require from the Theme tab.

  2. Use the Background tab to customize your desktop background as follows:

    • Set the Desktop Wallpaper to No Wallpaper.

    • Set the Desktop Colors to “Solid Color”.

    • Select a background color that suits your needs.

  3. Ensure that the Use colors from system theme option is selected in the Colors tabbed section of the Editing Profile dialog.

  4. In the gedit text editor, ensure that the Use default theme colors option is selected in the Colors & Fonts tabbed section of the Control Center dialog.

Customizing Desktop Fonts

To achieve a large-print desktop, perform the following steps:

  1. Use the Appearance Preferences tool to select the Large Print theme.

  2. Click on the Apply Font button to increase the size of the font that is used on the desktop and on window frames.

  3. Use the Desktop Font option to achieve a large-print desktop.

  4. If the Use default theme font option is selected in the gedit (Text Editor) Control Center dialog, gedit uses the font size that is specified in the large-print theme that you selected.

If you use applications that use panes, such as the file manager and help browser, you may need to change the size of panes to accommodate the large print. See the online help for the appropriate application for more information.