Specifications

28
7.5 Items Associated with the
Please note that not all units have this sub-menu – it is only present on units with
overlaying abilities.
Adjust keyers group (Applies only to
the VP-704XL)
Towards the end of this manual you will find a section titled ‘COMMON
OPERATIONS’ – this gives a step-by-step guide to keying out a particular color.
This menu item turns keying On or Off for the current foreground. A keyed image is
in essence one image superimposed over another – such that portions of the top
image are made transparent (keyed out), so that the background image can show
through. The following settings allow you to vary the colour(s) that are keyed out.
This menu item allows you to swap the foreground and background images when
Lock mode is set to Lock & Mix (Under Adjust output). 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.
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 conversion) may not
sample a 50% brightness as being exactly 50% i.e. sometimes 49% and
Adjust keyers
Swap fore/backgrnd [Off]
Adjust keyers
Keyer enable [Off]
Adjust keyers
Y Key min/max [ 0] [ 32]
Adjust keyers
Y Key softness [ 0]