Translations by Carlos Gong

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Open <gui>Universal Access</gui> and select the <gui>Seeing</gui> tab.

<link xref="a11y#vision">Seeing</link>, <link xref="a11y#sound">hearing</link>, <link xref="a11y#mobility">mobility</link>, <link xref="a11y-braille">braille</link>…

The Unity desktop includes assistive technologies to support users with various impairments and special needs, and to interact with common assistive devices. Many accessibility features can be accessed from the <gui>Universal Access</gui> section of <gui>System Settings</gui>.

The GNOME desktop includes assistive technologies to support users with various impairments and special needs, and to interact with common assistive devices. Many accessibility features can be accessed from the accessibility menu in the top bar.

You can change how long you must hold down the left mouse button before it is registered as a right click. On the <gui>Pointing and Clicking</gui> tab, change the <gui>Acceptance delay</gui> under <gui>Simulated Secondary Click</gui>.

To right-click with simulated secondary click, hold down the left mouse button where you would normally right-click, then release. The pointer fills with blue as you hold down the left mouse button. Once it is entirely blue, release the mouse button to right-click.

Some special pointers, such as the resize pointers, do not change colors. You can still use simulated secondary click as normal, even if you don't get visual feedback from the pointer.

If you use <link xref="mouse-mousekeys">Mouse Keys</link>, this also allows you to right-click by holding down the <key>5</key> key on your keypad.

In the <gui>Activities</gui> overview, you are always able to long-press to right-click, even with this feature disabled. Long-press works slightly differently in the overview: You do not have to release the button to right-click.

Quickly turn slow keys on and off

Quickly turn sticky keys on and off

If you press two keys at once, you can have sticky keys turn itself off temporarily to let you enter a keyboard shortcut in the normal way.

Thank you for taking the time to read the <em>Ubuntu Desktop Guide</em>.

Add an account

For security reasons, Ubuntu will not store your password on your computer. Instead, it stores a token that is provided by the online service. If you want to fully revoke the link between your desktop and the online service, <link xref="accounts-remove">remove</link> it.

Click the icon at the far right of the <gui>menu bar</gui> and select <gui>System Settings</gui>.

Online accounts

Remove an account

Click the <gui>Remove Account</gui> button in the lower-right portion of the window.

Click <gui>Remove</gui>.

Susanna Huhtanen

Why add your email or social media accounts to your desktop?

Why should I add an account?

For help with using Cheese, read the <link href="help:cheese">Cheese user guide</link>.

Most of your application settings will be stored in the hidden folders <file>.config</file>, <file>.gconf</file>, <file>.gnome2</file>, and <file>.local</file> in your Home folder.

This may include documents, spreadsheets, email, calendar appointments, financial data, family photos, or any other personal files that you would consider irreplaceable.

<link xref="bluetooth-connect-device">Connect</link>, <link xref="bluetooth-send-file">send files</link>, <link xref="bluetooth-turn-on-off">turn on and off</link>…

Click the Bluetooth icon on the top bar and select <gui>Set up a New Device</gui>.

Make sure that your Bluetooth adapter is switched on. Click the Bluetooth icon on the top bar and check that it's not <link xref="bluetooth-turn-on-off">disabled</link>.

Click the Bluetooth icon on the top bar and select <gui>Bluetooth Settings</gui>.

You can send files to connected Bluetooth devices, such as some mobile phones or other computers. Some types of devices don't allow the transfer of files, or specific types of files. You can send files in one of three ways: using the Bluetooth icon in the menu bar, from the Bluetooth settings window, or directly from the file manager.

Click the Bluetooth icon on the top bar and select <gui>Send Files to Device</gui>.

You can turn Bluetooth on to use Bluetooth devices and send and receive files, but turn it off to conserve power. To turn Bluetooth on, click the Bluetooth icon on the top bar and switch <gui>Bluetooth</gui> on.

Many laptop computers have a hardware switch or key combination to turn Bluetooth on and off. If the Bluetooth hardware is turned off, you will not see a Bluetooth icon in the top bar. Look for a switch on your computer or a key on your keyboard. The keyboard key is often accessed with the help of the <key>Fn</key> key.

To turn Bluetooth off, click the Bluetooth icon and switch <gui>Bluetooth</gui> off.

If calibration hardware is connected the <gui>Calibrate…</gui> button will create a new profile.

You will need to crop the TIFF file so that just the target is visible. Ensure the white or black borders are still visible. Calibration will not work if the image is upside-down or is distorted by a large amount.

You scan in your target file and save it as an uncompressed TIFF file. You can then click <gui>Calibrate…</gui> from <guiseq><gui>System Settings</gui><gui>Color</gui></guiseq> to create a profile for the device.

Alternatively you can select <gui>Import profile…</gui> from <guiseq><gui>System Settings</gui><gui>Color</gui></guiseq> when selecting a profile for a device.

<link xref="color-whyimportant">Why is this important</link>, <link xref="color#profiles">Color profiles</link>, <link xref="color#calibration">How to calibrate a device</link>…

ProPhoto is the largest space available and is frequently used for document archival. It can encode nearly the whole range of colors detected by the human eye, and even encode colors that the eye cannot detect!

Now, if ProPhoto is clearly better, why don't we use it for everything? The answer is to do with <em>quantization</em>. If you only have 8 bits (256 levels) to encode each channel, then a larger range is going to have bigger steps between each value.

Of course, using a 16 bit image is going to leave many more steps and a much smaller quantization error, but this doubles the size of each image file. Most content in existence today is 8bpp, i.e. 8 bits-per-pixel.

Notice how the white is not 'paper white' and the black of the eye is now a muddy brown.

Lucie Hankey

Add or remove a contact in the local address book.

Add or remove a contact

To add a contact: