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— Red, Green, and Blue Offset: Lets you offset individual channels.
— Scanlines Only: Lets you see just the scanlines in isolation while you adjust them.
Composite
Lets you choose how to composite the scanlines effect against the original image.
— Scanlines Only: Lets you output an image consisting only of the scanlines patter you’ve created. Good for creating different kinds of patterned textures and mattes.
— Composite Type: Lets you choose which composite mode is used to blend the scanline effect into the image.
Sky Replacement
Replacing a drab, colorless sky with a more vibrant one or matching skies shot on different days are common colorist tasks that are made more efficient with the Sky Replacement effect. The benefits of using Sky Replacement instead of traditional compositing methods are a focused specific toolset allowing you to:
— Dynamically match the foreground to the brightness and color cast of the sky.
— Use Tracking options to move the sky along with the clip’s camera movement.
— Add realistic computer generated sky elements, like sky color, horizon haze, clouds, and light sources.
(Left) The original bland sky, (Right) The image with a new better looking sky.
Selecting the Sky to be Replaced
It should be noted that the Sky Replacement effect does not do any sky selection itself, but rather takes that selection from other tools and focuses on blending the selection seamlessly with either a background plate of another sky or its own artificial sky generator. The benefit of separating the sky selection and the replacement tools is deliberate, as qualifying a sky is usually trivial, while getting a good mask at the horizon is not. This allows the colorist to use the right qualifier (HSL, Window, Magic Mask, etc.) for the particular scene, and then pass that on to the Sky Replacement effect. Another benefit of this arrangement is that the Sky Replacement effect can be applied to the same node as your qualifier, letting you select and replace the sky all in one node, and both tools can be updated concurrently as you use them.