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Time Difference
The Time Difference effect calculates the color difference between two layers and is a useful aid in color correction; use it to extract color differences when matching a clean background plate with foreground footage. It is also good for creating mattes to be used to apply trails of smoke, fire, or echoing effects. Once you've applied Time Difference to locate color differences in your footage, use color and levels controls to apply the color corrections.
Use Time Difference with Particle Playground to shed particles only from moving sections.
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