106.3. Accessibility
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Description: Demonstrate knowledge and awareness of accessibility technologies.
Key Knowledge Areas:
Basic knowledge of keyboard accessibility settings (AccessX)
Basic knowledge of visual settings and themes
Basic knowledge of assistive technology (ATs)
Terms and Utilities:
Sticky/Repeat Keys
Slow/Bounce/Toggle Keys
Mouse Keys
High Contrast/Large Print Desktop Themes
Screen Reader
Braille Display
Screen Magnifier
On-Screen Keyboard
Gestures (used at login, for example GDM)
Orca
GOK
emacspeak
There are some people with disabilities . A disability is any condition that makes it more difficult for a person to do certain activities or interact with the world around them. People with disabilities might like to work with Linux too . The good news is that Linux distributions provide great advantages over proprietary alternatives for people with disabilities!
What is Accessibility?
Accessibility , means making software usable by disabled people. That includes blind people of course, but also people who have low vision, are deaf, colorblind, have only one hand, can move only a few fingers, or even only the eyes.
These options are available in display managers (login screen) and in major desktops (like gnome, kde, xfce, ...). Its logo is a human stretching its hands a legs.
In Gnome the config is located at Settings ~ Universal Access.
Linux provides accessibility in 3 sections:
AccessX : AccessX or the Keyboard Accessibility preference tool allows you to set some options for people who have difficulty with keyboard .
Visual Settings : Visual Settings help people with vision problems:
Assistive Technologies : things like text-to-speech (tts)
AccessX
Sticky keys: Helps users who have trouble pressing multiple keys at once, and users who have use of only one hand
Slow keys allows the user to specify the duration for which one must press-and-hold a key before the system accepts the keypress.
BounceKeys: Requires a delay between keystrokes before accepting the next keypress .
MouseKeys: Enables a group of keys to emulate a mouse. Pressing keys in this group will move a pointer around the screen and perform mouse button actions.
RepeatKeys: Enables the user who has trouble releasing keys quickly once they press to slow down how fast keys start repeating once they're pressed.
Hover Click: Enable click or drag simply by hovering mouse pointer over a control or object on the screen.
Visual Settings
High-contrast : Helps users who have trouble seeing text unless contrast is corrected, such as white text on a black background, or vice versa.
zoom (Magnifier) : Helps users with visual impairments who need larger text and images.
Large Text: Make reading text easier by using larger fonts in menus.
On screen keyboard: Helps users who cannot type at all, but who can use a mouse.
GOK is the Gnome On-Screen Keyboard. As the title implies, it is a keyboard that appears on the display as an alternative for those who are not able to use a regular keyboard.
Visual alerts: Replace system sounds with visual cues(like flashing th e screen)
Screen reader: A text-to-speech system to read what's on the screen
Text to speech
There are some Text to speech software in Linux which read dialog boxes for us . Software like orca and emac speak .
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https://lwn.net/Articles/302159/
https://opensource.com/life/15/5/accessibility-linuxhttps://accessibility.linuxfoundation.org/a11yweb/presentations/2005f2f/johnson-20050124-accessx.html
https://wiki.ubuntu.com/Accessibility/Reviews/GOK
https://jadi.gitbooks.io/lpic1/content/1063_accessibility.html
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