Kramer-electronics VP-773AMP Manuel d'utilisateur télécharger pdf (Page 42)

VP-773AMP - The OSD Menu

6.8.1 The Luma Keying Feature

The luma keying feature is an easy-to-use method of compositing two video

sources into a single image. By setting up a “key” image or clip on a black

background, it can be merged – or overlaid – onto the primary video. The key

image is transparent in the areas of its dark background, resulting in a picture which

looks as if the key image is cut out and pasted over the primary image. This useful

function of combining images from two different sources is suitable for many

applications, such as sub-titling, labeling, advertising or logo insertion.

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 it is recommended to 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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Kramer-electronics VP-773AMP Manuel d'utilisateur Page 42