You can enable Mercury Transmit in After Effects through the Video Preview preferences.
Here's a breakdown of how to do it:
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Access Video Preview Preferences: Go to Preferences > Video Preview.
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Enable Mercury Transmit: Look for the option labeled "Enable Mercury Transmit" and make sure it's checked/toggled on. This setting allows After Effects to use external video devices for real-time preview.
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Toggle with Keyboard Shortcut: You can also toggle Mercury Transmit on and off using the '/' key on the numeric keypad. If you're on a Mac without a numeric keypad, use Control+Shift+/ on the main keyboard.
Essentially, Mercury Transmit allows After Effects to send your composition preview to an external video monitor or device for more accurate color representation and a better overall previewing experience, especially when working with high-resolution footage or color-critical projects. Make sure your external monitor or device is properly connected and configured within your operating system before enabling this feature.
