Until around — their logos were opaque black and white, presumably due to being inserted into the analog CVBS signal just before being broadcast instead of an analog YUV, RGB or digital SDI signal, while in the mids they upgraded tv logo bottom of screen annoying colorized but still opaque logos. Few minor cable and satellite channels show their logos in the bottom-right corner. Top-left corner is also a common location, used by TTV and several cable and satellite channels. At times, networks will superimpose a semi-transparent watermark immediately adjacent to their DOG to advertise an upcoming special event that the network will be broadcasting e.
Digital on-screen graphic
In Israel, channel watermarks more often appear on the top left or the top right since Israeli cable and satellite based services often have the channel description and programming OSD on the bottom of the screen. It remained so until Channel One was the first channel to have introduced their watermark in and by watermarks appeared on other channels.
The first logo bug appeared in the 's on cable networks and local TV stations. Initially, the logos were placed on the top-right corner, but in they were moved permanently to the top-left corner, to allow television ratings to tv logo bottom of screen annoying shown in the top-right corner. DOGs were first used on satellite and cable television systems in their early days, when broadcasts were unmarked. One of the easiest and most sought-after devices used to generate DOGs by hobbyists is the s vintage Sony XV-T video superimposer. Some stations display their on-screen graphics permanently.