Lock screen

A lock screen is a user interface element used by various operating systems. They regulate immediate access to a device by requiring that the user perform a certain action in order to receive access, such as entering a password, using a certain button combination, or performing a certain gesture using a device's touchscreen. While most lock functions on PC operating systems only utilize a login screen, lock screens on mobile devices often provide more functionality beyond unlocking the phone: such as notifications for emails and text messages, a date and time display, or shortcuts to certain applications.

Lock screens by platform

Mobile operating systems

Operating systems that run on smartphones and tablets typically use a gesture-based lock-screen. Mobile phones manufactured by Neonode were unlocked by swiping to the right on its touchscreen. Apple's iOS; used by the iPhone and iPad lines, utilizes a similar unlock mechanism using an on-screen slider widget to the right. Beginning on iOS 5, sliding in the other direction sends the user directly to the camera app. On iOS 7, the slider widget was removed as part of a larger overhaul of the iOS interface, and users can now swipe from any point of the screen. The lock screen also displays a clock, notifications, and provides audio playback controls.

Screen

Screen or Screens may refer to:

Arts

Filtration / selection processes

Media and music

Screen (magazine)

Screen is a leading weekly film magazine, published in India. Established in 1951, it is owned by The Indian Express publishing group. The content focuses on India's Hindi film industry, a.k.a. Bollywood, located mainly in Mumbai. It also has an e-magazine version.

History

Screen was first published on 26 September 1951 with Manorama Katju as its managing editor. She was succeeded in 1959 by S.S. Pillai who died in office in 1977. The magazines was started by the Indian Express newspaper group.

B. K. Karanjia who was previously editor of Filmfare, stayed Screen editor for 10 years.Udaya Tara Nayar, rose the ranks within Screen Magazine and became the editor between 1988-1996 and 1998-2000. Veteran film journalist, Bhawana Somaaya was the editor of the magazine (2000-2007). In 2007 she was replaced by Ex- Society Magazine and HT Style/Saturday editor Priyanka Sinha Jha who remains the editor till date.

Screen Awards

Screen organizes and sponsors the Screen Awards for movies in Hindi cinema, established in 1995. It also sponsors Screen Gold Medal for excellence in direction at the Film and Television Institute, established in 1967.

Blend modes

Blend modes (or Mixing modes) in digital image editing are used to determine how two layers are blended into each other. The default blend mode in most applications is simply to hide the lower layer with whatever is present in the top layer. However, as each pixel has a numerical representation, a large number of ways to blend two layers is possible. Note that the top layer is not necessarily called a "layer" in the application. It may be applied with a painting or editing tool.

Most graphics editing programs, like Adobe Photoshop and GIMP, allow the user to modify the basic blend modes - for example by applying different levels of opacity to the top picture.

Normal blend mode

This is the standard blend mode which uses the top layer alone, without mixing its colors with the layer beneath it.

Where a is the value of a color channel in the underlying layer, and b is that of the corresponding channel of the upper layer. The result is most typically merged into the bottom layer using "simple" (b over a) alpha compositing, but other Porter-Duff operations are possible. The compositing step results in the top layer's shape, as defined by its alpha channel, appearing over the bottom layer.