Sony XVS-7000 Users Guide - Page 107

Keys 4 Chapter Overview A key is an effect in which a part of the background image is replaced by an image or superimposed text. The signal determining how the background is cut out is termed the "key source," and the signal that replaces the cut-out part is termed the "key fill." The system component responsible for processing a key is referred to as a "keyer." Each M/E bank and the PGM/PST bank has eight keyers. Keys supported in 4K format The following keys can be used on each switcher bank. • 3840×2160P: Key 1 to key 4 • 3840×2160PsF: Key 1 to key 2 Key 3 and key 4 in 3840×2160P format are called "sub keys" due to restrictions in their functionality. You can also disable use of key 4. For details about function restrictions of sub keys, see "Sub key restrictions" (page 526). For details about sub key settings, see "Setting the Sub Key Mode" (page 442). Key Types The key type indicates the manner in which the key source signal is used to cut out the background. Type Luminance key Linear key Description Clean mode The background is cut out Supported according to the luminance (Y) of the key source signal, and at the same time the key fill signal is cut out and then added to the background signal. This is a type of luminance key, Supported but there is a reduced variability in gain, allowing more precise adjustment. Type Color vector key Chroma key Wipe pattern key Key wipe pattern key Description Clean mode The key signal is created from a combination of the luminance and chrominance components of the key source signal. When perfect keying is not possible with a luminance key, this allows a key signal to be created even if the luminance level is low, provided that the colors have high saturation. Supported A key signal based on a particular color is used to cut out the background, and the key fill is then inserted. Not supported This uses the wipe pattern selected for a transition to cut out the background, and the key fill is then inserted. Not supported This uses the wipe pattern selected for an independent key transition to cut out the background, and the key fill is then inserted. Not supported Clean mode In a luminance key, linear key or color vector key, you can enable clean mode. When clean mode is enabled, key fill is added to the background without cutting out with key source. This improves the keyed image quality, but means that the part of the key fill signal which is not to be inserted must be completely black, or it will color the background. You set clean mode in the Type menu for each keyer. For details, see "Setting the Key Type" (page 110). In the following situations, clean mode cannot be enabled. • When key invert is enabled • When the key fill is a matte • When the key edge is an outline • When the key edge is normal and soft edge is enabled • When fine key is enabled • When key positioning is enabled 107