Importing Mattes			Accessing the Geometry Controls
Chapter 15, Secondary Colour Grading

Geometries are spline-based objects you draw directly on a shot or an image. When performing secondary colour grading, you can create geometries to isolate particular objects or areas in the image to include with, or exclude from, the secondary colour grade.

You can include multiple geometries with each secondary.

Once geometries have been added, you can:

• Resize, reposition, and rotate them.

• Modify the softness, colour, opacity, and blur values of areas isolated by geometries.

• Parent multiple shapes to an axis.

• Change the priority order.

• Show or hide geometries in the Player.

• Invert geometries.

• Delete or reset geometries.

• Link geometries using logical operations from the previous secondary layer to the next one.

• Animate and track geometries.

Geometries are useful in many colour grading situations, from selectively colour grading large objects like the sky to small objects like a person's eyes. When you want to colour grade an object that moves through the shot, you can use the tracker to make a geometry follow the moving element. See Animating Geometries with the Point Tracker.

You can work with tangents and vertices to modify, scale, and rotate a geometry around its axis. You can also use the axis of the geometry to move it around the image. You can add and delete axes, and use one axis to move multiple geometries.

Note: Field-based projects viewed on the data monitor will demonstrate a half-pixel downshift. Geometries added to the image will also display this downshift.