As the size of the image is not known in advance it seems its up to the app per http://qt-project.org/doc/qt-5/qml-qtquick-image.html
Note: Images are often the greatest user of memory in QML user interfaces. It is recommended that images which do not form part of the user interface have their size bounded via the sourceSize property. This is especially important for content that is loaded from external sources or provided by the user. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to unity8 in Ubuntu. https://bugs.launchpad.net/bugs/1373462 Title: [background] Preview/Background is black for some images Status in Libqtelegram - a qt library to access telegram.: Fix Committed Status in Messaging App: New Status in “messaging-app” package in Ubuntu: Confirmed Status in “ubuntu-system-settings” package in Ubuntu: Fix Released Status in “unity8” package in Ubuntu: Fix Released Status in “messaging-app” package in Ubuntu RTM: New Bug description: With some images the preview and the background is black but the image is fine in the gallery app. For example picture attached looks correct, but preview and background are black. TEST CASE: 1. Upload the attached picture to the phone with mtp 2. Go to system-settings / background 3. Tap 'Add an image' 4. Select this image -> Verify that the preview is correct 5. Validate your choice, 6. Press the power button twice to show the greeter -> Verify that the background is correct ACTUAL RESULT Background and preview are black. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: ubuntu-system-settings 0.3+14.10.20140913-0ubuntu1 [origin: Ubuntu RTM] Uname: Linux 3.4.67 armv7l ApportVersion: 2.14.7-0ubuntu1 Architecture: armhf Date: Wed Sep 24 16:34:18 2014 InstallationDate: Installed on 2014-09-16 (8 days ago) InstallationMedia: Ubuntu Utopic Unicorn (development branch) - armhf (20140916-030205) SourcePackage: ubuntu-system-settings UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/libqtelegram/+bug/1373462/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp