Kramer Electronics VP-770 - Manual (Page 42)

VP-770 - The OSD Menu 37
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6.8.1 The Luma Keying Feature
The luma keying feature lets you display the PiP window (the key image) as semi-
transparent over the main window. This feature can be used to have the PiP
window display a static or dynamic logo, for example, which will appear on a
transparent background.
To apply the luma keying feature, first set the PiP window to the desired size and
location and then turn luma keying On. The PiP image will show without its
background.
The lower the luminance in the PIP window, the more transparent it becomes, thus
letting the main window image show. The higher the luminance, the less
transparent it becomes, not letting the main window show through. To use this
feature we recommend that you set the PIP image as follows: use low-luminance
colors for the background (the key image portion) and high-luminance colors for the
logo.
For certain displays, the screen may flicker once for about a second
after activating or changing the luma keying setting.
Since luma keying is a volatile parameter, it may reset unexpectedly
following a change in the setup. So we recommend that you activate it
after completing the setup.
When the luma keying feature is On, any change in the setup (either by
the user or by resetting due to a setup change) may cause the screen to
flicker once. The luma keying will recover automatically after resetting.
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