TV One C2-7100, Operation Manual

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background image can show through. The following settings allow you to vary
the colour(s) that are keyed out.
This menu item is only present on single-channel scalers – dual and quad-
channel scalers have the layer priority set within the ‘Adjust Windows’ menu.
This menu item allows you to swap the foreground and background images
when Lock mode is set to Lock & Mix. It will have no effect in any other mode
(since no background is present).
Normally, your foreground is the input (window) source and your background
is the lock source. This then allows you to superimpose any graphics or video
input on top of the lock source by keying out a certain color or range of colors
in the input source. Swapping them means that the input source moves to the
background and the lock source is now in front of it. Thus you are now keying
out the lock source colors to reveal the input source behind it.
Note that this is different to simply swapping over the input and lock sources
as that would affect the final output resolution – see examples below:
Input
source Lock
source Swap Foreground
(keyed) Background
(non-keyed) Output
resolution
XGA NTSC Off XGA NTSC NTSC
XGA NTSC On NTSC XGA NTSC
NTSC XGA Off NTSC XGA XGA
NTSC XGA On XGA NTSC XGA
(XGA is 1024x768)
You will see that the Swap between foreground and background has no effect
on the output resolution as this is always set by the Lock source.
The Min/Max parameters are used to select what range of Y (luminance/grey-
scale) values are made transparent within the selected window/lock source.
In order to key out part of an image, start with the max value and increase it
until the required lighter parts within the window/lock source disappear. Then
adjust the min level to bring back any darker parts of the image.
The Y Key softness option removes noise from the keyed image, generally at
the edges. Adjust as required to make the edges of the key as sharp or as
soft as desired. The noise is where the analog to digital process (A/D
Adjust keyers
Swap fore/backgrnd [Off]
Adjust keyers
Y Key min/max [ 0] [ 32]
Adjust keyers
Y Key softness [ 0]