Magewell Ultra Encode User Manual, Reference And Faq page 20

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Set Color
Set color format of preview and stream video.
Brightness: range from -100 to 100, the default value is 0.
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Contrast: range from 50 to 200, the default value is 100.
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Saturation: range from 0 to 200, the default value is 100.
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Hue: range from -90 to 90, the default value is 0.
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Reset: restore all settings of the color to default settings
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Done: save your configuration
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Preview Thumbnails
Thumbnails give you a quick snapshot of your video as they're browsing on the
target video platform.