Digital on-screen graphic

As Corner Logo (german corner, corner ') is referred to, for example, while watching TV, the station logo in one of the four corners of the image. It is designed to be able to see at a glance which program it is. In English-speaking countries rather the terms digital on-screen graphic (DOG), Bug or Watermark are common.

But even with billboard advertising, websites, etc. can be applied Corner logos.

Technology

The Corner Logo is generally mixed only after the added transmission mixer. For this there is a special logo generator, which is looped in the signal. Semi-transparent logos Corner - common in Germany - have "ge -keyed " in addition. This means that according to easily change the color of the logo corresponding to the corner pixels on the TV signal at the position. This requires in digital signal processing continuous computing power of the logo generator.

When amateur radio television the callsign of the ATV station is displayed for identification rather than a logo. As working mostly on the entire signal through analog composite signals can with self-made technology often only the luminance signal are processed, thus no colored logos. The mostly self-built OSD Inserter basically consist of a microcontroller, which evaluates the sync pulses of the video signal and affects additive at the right moment, the signal amplitude or the video signal umtastet to represent pixels.

In contrast to the transparent logo also exist color logos, which, however, draw more attention to himself and thus partially can distract from the program (colored sat.1 ball, current WDR logo). The RBB uses this property in the appearance of the Corner logos during the station ID and trailers. These are " branded " with a red logo Corner since August 18, 2012, while the logo is showing subtle white-transparent in the current program.

History

In German-speaking logos were first only briefly appears to prevent video piracy of recordings in the 1980s. Only when the first private TV station came up ( and they had permanently displayed their logo), this trend also followed the public broadcaster. In German-speaking logos are usually top right or top left. The best-known exception is RTL II, which has the logo at the bottom right. Another peculiar feature is Yavido clips, which had its logo in the start time is in a corner, but in the top center.

Unlike German language channels sends the BBC today often without logo, and also the British ITV logo can be seen only with great difficulty. However, most other UK channel logos are comparable to the German.