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choose Set Desktop Picture (in the Services sub-menu); similarly, Ctrl-click an image in Safari and you may be able to select Use Image as Desktop Picture, depending on how the site is set up. However, the System Preferences pane provides a much greater degree of control, along with a central area to access collections of images. (You can also access this pane by right clicking on your desktop and choosing Change Desktop Background.) In System Preferences > Desktop & Screen Saver click the Desktop tab to access desktop settings. This will display a thumbnail of the current background image, alongside which will be its title. From the pane on the left, you can select collections of images. By default, you’ll see two under the collapsible ‘Apple’ list (Desktop Pictures and Solid Colours), and your iPhoto and/or Photos albums appear under relevant headings. The next item is a collapsible list called Folders, to which you can add custom folders by using the ‘+’ button. (Sneaky tip: Apple includes a bunch of folders in /Library/Screen Savers/Default Collections, which are otherwise only used for screen savers. They’re worth adding if you like wildlife, space and landscape shots.) To change the desktop background, select a collection and then click any of the images within. Alternatively, you can drag an image to the well from Finder. (Dragging from Photos doesn’t work, but you can use the Share button in that app to set a selected item as your desktop image.) If the image is of a suitable size and aspect ratio for your display, it will be resized automatically. If not, a 38 MACWORLD • JANUARY 2017 MWJAN17.indd 38

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