User manual

Front Panel Operations Imagestore HDTV User Manual
Page 64 Miranda Technologies Ltd
Clip, Gain & Trans
Clip
Clip is the level under which the key signal will be forced to black. In a
keying process this will result in a total absence of fill video in areas where
the incoming key signal is less than the clip level.
Gain
The gain level amplifies the key signal, forcing grey levels towards and up to
white. In a keying process this will result in the fill signal being less
transparent than it otherwise would be in areas with a grey key signal.
Transparency
Transparency controls the luminance content (grey scale value) of the key
signal and therefore the amount of background video that will 'seep' through
the keyed image.
Typical CGT Values
For optimum results set the CGT values to the following:
♦ Clip 64 (Black level)
♦ Gain 940 (Peak White)
♦ Transparency 512 (Fully opaque)
Clip and Gain values are in the range of 0 (black) - 1023 (white),
Transparency is in the range of 0 (clear) - 512 (opaque), and can be adjusted
using the arrow control keys ⊳ .
Cut To/From Black
Switches the output from DSK 1 between black and background video, plus
fill and key signals.
Cut From Black
Switches the output from DSK 1 from black to background video plus fill
and key signals.