Author: Guoxin Lin

Rotopaint(pressing P on Node Graph)

For clean up and clone

When drawing your shapes, you can:

1. Click in the Viewer to place points. You can drag while clicking to pull out Bezier handles or adjust B-Spline tension.
2. Ctrl/Cmd+drag to sketch the shape freely.
3. Click the first point or press Return to close the shape. To leave the shape open, press Esc.
4. Ctrl/Cmd+Alt+click to add points to an existing shape.
5. Select a point and press Z to increase the smoothness of the point.
6. Select the point and press Shift+Z to cusp the point.
7. Select the point and press Delete to delete a point.
8. Beziers: Shift+drag on a tangent handle to snap the opposite handle to the same length. Ctrl/Cmd+drag on a tangent handle to move it independently of its opposite handle.
9. B-Splines: Ctrl/Cmd+Alt+drag on a point to adjust its tension.

Erode (filter)

Filters input pixels relative to the size control, and is particularly useful with mattes. Negative values cause brighter areas to expand into darker areas and positive values cause darker areas to expand into lighter areas. Use the filter dropdown to control the erode computation speed (box) versus quality (gaussian).

Erode (filter) is similar to Erode (fast), but can be computationally more expensive because you can select the filter type to improve the erode quality.

FrameHold

Lets you either:

• pick one frame and use that frame at every frame of the input clip, or • use every certain number of frames of the input clip (for example, every fifth frame).

Grain

The Grain node lets you add synthetic grain (rather than grain derived from actual film stock) to an image. This helps you ensure that all of the elements in your composite, including those which were digitally generated, look like they were shot on the same film stock.

The presets dropdown menu includes predefined types of grain, such as Kodak 5248 and Kodak 5218. These are the correct size for 2K scans.

You can also adjust the Grain node’s controls to match a sample piece of grain:

1. Find a sample with a rather constant background.
2. Blur the sample to remove the grain.
3. Connect the blurred sample to the Grain node’s input.
4. In the Viewer, wipe between the Grain node and the original sample image, and adjust the Grain node’s controls to match the grain. It helps to view and match each of the red, green, and blue channels separately.

Shuffle

Shuffle lets you:

1. rearrange up to 8 channels from a single image (B input). For example, you can use it to swap rgba. red for rgba. green, and vice versa,
2. rearrange channels between two separate nodes (A and B input), like a foreground and background branch.
3. replace a channel with black (removing the alpha channel, for example) or with white (making the alpha solid, for example),
4. create new channels.

PlanarTracker

PlanarTracker is a powerful tool for tracking surfaces that lie on a plane in your source footage. Planar tracking is often better than tracking individual points (with the Tracker node for instance) as it takes a great deal more information into account and gives you a more accurate result. A rigid surface, like a wall or a side of an object, are good planes to track. You can use your tracking results to replace the tracked plane with another image for instance. You can define the region to track by creating and animating roto shapes.

Conerpin 2D

The CornerPin2D node is designed to map the four corners of an image sequence to or from positions derived from tracking data. In practice, this node lets you replace any four-cornered feature with another image sequence. You can use it to place an image in an on-screen television, for example.

Before using this node, you should use the Tracker node to generate four tracks, one per corner, on the feature requiring replacement.

Convolve

G

Color：Logarithmic and Line

Colorcorrect(pressing C on Node Graph)

The ColorCorrect node is used to make quick adjustments to contrast, gamma, gain, and offset. You can apply these to a clip’s master (entire tonal range), shadows, midtones, or highlights.

You can control the range of the image that is considered to be in the shadows, midtones, and highlights using the lookup curves on the Ranges tab. However, do not adjust the midtone curve – midtones are always equal to 1 minus the other two curves.

OCIOColorSpace

Much like the standard ColorSpace node, you can use the OCIOColorSpace node for converting an image sequence from one colorspace to another. The OCIOColorSpace node is based on the OpenColorIO library.

Blur:

Erode blur

Similar to Erode (filter) , but smoother, input pixels are filtered relative to the size  control. Negative values cause brighter areas to expand into darker areas and positive values cause darker areas to expand into lighter areas – particularly useful with mattes. Additionally, you can add blur to the input using the blur  and quality  controls.