Adjust the Luma of the Grain

Adjusting the luma of the grain changes the grain's intensity.

To adjust the grain luma:

1. Click the curve that you want to modify. For example, select the Red curve if the grain is too red or not red enough.

You can also click the Red, Green, or Blue labels beside the checkboxes to select a curve. Click the yellow checkbox on the left of the curve to toggle the visibility of the curve for that channel.

2. In the curve editor, select and drag a control point that you want to move.

For a list of other things you can do in the curve editor, see the "Editing Granularity Curves" section that follows.

3. Click the curve to add a control point.

Keep in mind that typical granularity curves are usually smooth, and excessive control points could make the curve discontinuous. This being said, in most cases, the three first steps of this process (Apply the Add Grain Operator, Analyze the Grain, and Compare the Grain) should yield satisfactory results.

4. Repeat the steps for different areas of the target clip until you are satisfied with the results.
5. You can continue the process by adjusting the grain size.

Editing Granularity Curves

The Add Grain curve editor has many of the same features found in graphs elsewhere in combustion. For this graph, the horizontal axis is luma (brightness) and the vertical axis is gain (intensity).

To view and edit the curves:

• To add a point to the curve, click the line.
• To adjust the slope of the curve, click a point to display a handle, then drag the handle.
• To break the two sides apart, press Ctrl / Command while dragging a handle. Repeat to join them together again.
• To move a point, click and drag it. As you drag, the coordinates are displayed.
• To reset all the curves, click Reset All (and other settings such as Radius and F-stop).
• To reset only the curves, click Reset Curves.
• To delete a point on the curve, select it and press Delete.
• To select all the control points (for the curves that are visible), press Ctrl+A / Command+A. To deselect all, press Ctrl+D / Command+D (or just click the gray area of the graph).

Note: If you delete after selecting all points on a curve, you cannot add points to the curve until you click the Reset Curves button to reset the three curves.

• To zoom the curves, press Ctrl, click a gray area of the graph where you want to zoom, and drag up (or towards the right) to zoom in, or down (or towards the left) to zoom out.
• To pan the curves (after zooming), press Alt (Windows) or Option (Macintosh) while dragging on a gray area of the graph.

Grain from One Frame to the Next

It is important to remember that grain pattern in a clip changes from frame to frame. Grain created by the Add Grain operator also changes from frame to frame.

If you are holding a single frame for a static effect, you can add grain so that the image changes a bit. You will see the aggregate moving noise caused by the grain.

If you get a lot of lighting changes within a clip, you may need to keyframe through several settings of the Add Grain operator.