3025EMC Master Control Switching & Channel Branding
Revision 3.0.3 Page 69
125 for range 16-235 non-inverted
131 for range 16-235 inverted
127 for range 1-254 non-inverted
129 for range 1-254 inverted
It should always be in the range of 16 - 235.
4.8.3.3. Additive / Multiplicative Mode
This keyer can either operate in an additive mode or in a multiplicative mode. Note for additive keying
the foreground signal is not multiplied by the key. Thus care is needed to ensure that the fill signal is
black outside the area intended to be keyed. If this condition is met then additive keying will normally
give better results, especially from artifacts around the edges.
4.8.3.4. Self Key
This mode is used if there is no key signal associated with the fill signal. When this option is used the
fill signal is applied internally to the key input. All other key setting options still apply.
4.8.3.5. Key Inverted
The key signal applied to the EMC should use the lowest value when background is required and the
highest value where maximum keying is required. If the key signal is inverted to this, then this check
box can be ticked to convert the signal into the form required.
4.8.3.6. Fill Signal Settings
Use Matte as Keyer Foreground.
Each physical keyer has a matte (flat field colour generator) this can be used instead of the fill signal
as the keyers foreground. Check this check-box for this operation.
4.8.3.7. Matte Colour
The colour of the Matte is determined by the three edit boxes, these determine the Y, Cr and Cb
values of the colour and are shown and edited as zero indexed 8-bit digital video values between 0
and 219. The following gives examples of primary colours and the values needed to generate them.
Black: Y = 0, Cb = 0, Cr = 0
White: Y = 219, Cb = 0, Cr = 0
Yellow: Y = 219, Cb = 136, Cr = 0
Blue: Y = 219, Cb = 120, Cr = 0
Red: Y = 219, Cb = 0, Cr = 120
Cyan: Y = 219, Cb = 0, Cr = 136
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