3025SW Master Control Switching & Channel Branding
Page 66 Revision 1.0
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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