Translations by Carlos Gong

Click the <app>Ubuntu Software Center</app> icon in the <gui>Launcher</gui> or search for <input>Software Center</input> in the <gui>Dash</gui>.

Find the application that you want to remove by using the search box or by looking through the list of installed applications.

Some applications depend on other applications to work properly. If you try to remove an application that is needed by another application, both will be removed. You will be asked to confirm whether you want this to happen before the applications are removed.

Add/remove software

<link xref="addremove-install">Install</link>, <link xref="addremove-remove">remove</link>, <link xref="addremove-sources">extra repositories</link>…

Add &amp; remove software

With the <app>Cheese</app> application and your webcam, you can take photos and videos, apply fun special effects and share the fun with others.

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

The recommended way of backing up your files and settings is to let a backup application manage the backup process for you. A number of different backup applications are available, like <app>Déjà Dup</app>.

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.

It is important to choose an appropriate <em>backup medium</em>, too. You need to store your backups on a device that has sufficient disk capacity for all of the backed-up files.

Some of these options have sufficient capacity to allow for a backup of every file on your system, which is also known as a <em>complete system backup</em>.

<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>.

To control access to your shared files, refer to the <gui>Bluetooth Sharing</gui> settings. See <link xref="sharing-bluetooth"/>.

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.

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 using the Bluetooth icon on the top bar, or from the Bluetooth settings window.

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.

Calibrating your screen should be a requirement if you're involved in computer design or artwork.

By using a device called colorimeter you accurately measure the different colors that your screen is able to display. By running <guiseq><gui>System Settings</gui><gui>Color</gui></guiseq> you can create a profile, and the wizard will show you how to attach the colorimeter device and what settings to adjust.

Color profiles can be imported by opening them.

The profile can be imported by double clicking on the <input>.ICC</input> or <input>.ICM</input> file in the file browser.

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.

You can be notified if your color profile is old and inaccurate.

Can I get notified when my color profile is inaccurate?

Unfortunately we can't tell without recalibrating whether a device profile is accurate. We can use a simple metric of the amount of time since calibration to determine if a recalibrate is recommended.

Some companies have very specific timeout policies for profiles, as an inaccurate color profile can make a huge difference to an end product.

To set the policy for display and printer devices, you specify the maximum age of the profile in days:

<output style="prompt">[rupert@gnome] </output><input>gsettings set org.gnome.settings-daemon.plugins.color recalibrate-printer-threshold 180</input> <output style="prompt">[rupert@gnome] </output><input>gsettings set org.gnome.settings-daemon.plugins.color recalibrate-display-threshold 180</input>

Default monitor profiles do not have a calibration date.

Why don't the default monitor profiles have a calibration expiry?

The default color profile used for each monitor is generated automatically based on the display EDID which is stored in a memory chip inside the monitor. The EDID only gives us a snapshot of the available colors the monitor was capable of displaying when it was manufactured, and does not contain much other information for color correction.

As the EDID cannot be updated, it has no expiry date.

Getting a profile from the monitor vendor or creating a profile yourself would lead to more accurate color correction.

<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>…

Testing color management isn't hard, and we even supply some test profiles.

How do I test if color management is working correctly?

The effects of a color profile are sometimes subtle and it may be hard to see if anything much has changed.

In GNOME we ship several profiles for testing that make it very clear when the profiles are being applied:

<em>Bluish Test</em>: This will turn the screen blue and tests if the calibration curves are being sent to the display

<em>ADOBEGAMMA-test</em>: This will turn the screen pink and tests different features of a screen profile