Grass Valley Imagestore 750 v.2.0.1 - Manual (Page 84)

Front Panel Operations Imagestore 750 User Manual
Page 84 Miranda Technologies Inc.
Source
Self key: When the source option is set to self, the key data is derived from
the luminance content (Y value) of the "Fill" signal itself.
Separate key: When the source option is set to separate, the key data is
derived from the luminance content (Y value) of the separate "Key" image.
None: When the source option is set to none the key for an image is set to
white so that there is no image transparency.
Type
Full Key is where the foreground image (Fill) is passed only where the key
signal is present.
Linear Key is where the background and foreground (Fill) are summed and
the foreground (Fill) is unaffected by the key.
Sense
Normal, a black-level key signal that will cause the "Fill" image to be fully
transparent and not appear over a background. A white-level key signal will
cause the "Fill" image to be opaque with no background appearing through.
Intermediate keying levels will produce a pro-rata transparency effect.
Invert reverses this effect and white-level key signals now create a fully
transparent "Fill" image with black-level signals producing an opaque "Fill"
image.
Masking
Defines a mask area for the keyer. The number range is determined by the
width and height of the image in pixels, and is limited by the selected
standard. To maintain correct YUV values the pixel count will increment in
units of 2. Anything fed into the keyer (i.e. external fill and key, and the
output from the stores) can be masked. Note that if viewing the stores on the
monitor output, they will not be masked as the masking is now done in the
keyer rather than in the store.
Disable
Ignores the Set Masking values.