Keying Mattes and Shapes
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| What does a key do? | A key tells Motion which parts of a composited image should be visible and which parts should be transparent. White in the mask indicates which areas will be opaque and black indicates which will be transparent. | |
| What filter can be used to compensate for varying midrange luminance levels in source footage you are trying to key and composite? | The Gamma filter can be used to correct the contrast of video content from difference sources. | |
| Name a filter that can trim and smooth pixels from the edges of a key. | The Matte Magic Filter. | |
| Describe how you would deal with the problem areas in a key that a general luminance, blue/green screen, or manual key might not address. | Layers or groups can be duplicated to localize effects, and individual masks can be manipulated to address particular areas of an image. | |
| How would you manually adjust a key over a period of time? | You can move and animate B-Splines and their tangent handles using a process known as rotoscoping. The Record Animation button allows you to record changes at particular points in time and have the computer interpolate changes between the resultant keyframes. | |
| What type of key can use the inherant black and white levels of an image or footage to pull a key? | A luma key | |
| toggles snapping on/off in the Canvas | N | |
| selects the Select/Transform tool | Shift-S | |
| toggles Record Animation on/off | A | |
| selects all | command-A |
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