Using the Blend parameters you can gesturally modify the luminance at the edge of the key, so that it blends with the luminance in the background image. For example, when the front image is darker than the back image, you can use the Blend parameters to lighten the edge of the key.

With the Blend Luminance controls, you can adjust the edge blending and maintain the edge detail. Adjusting the Edge Size amount uses pixel analysis to determine the extent of the adjustment.

To blend the front and back images:

1. Set a Player view to Tool Output and, with the selection on the Keyer super tool node, cycle to Comp Output—see Cycling Through Inputs and Outputs.
2. Select Blend from the Sample menu or press Shift + B.
3. Blend the front and back image. Click anywhere in the image window, and modify the parameters that appear by dragging the sliders; you do not need to click a specific area.

   

   

   Drag:	To:
   Luminance	Darken or lighten the edge of the key. Luminance only affects the luma of the edge.
   Edge Size	Set the range for the blend. Drag right to soften the edge and blend further into the key. Drag left to harden, or create a thinner, edge.

4. To modify both parameters, move the mouse between them to highlight a parameter, or drag the pen vertically. When you highlight the parameter you want to adjust, drag the slider.
   NoteIf you do not like the result, you can click Undo to reset parameters after you complete an operation.
5. When you are finished modifying the displayed parameters, click another area of the image without highlighting a parameter to hide them or press the Esc key.
6. To add a cast to the edge of the key and improve the overall look by matching the edge with a color cast in the back image, drag the Edge Balance trackball toward the color you want to add. The trackball only affects the chroma of the edge.

   Modifications made using the trackball are cumulative; each movement of the trackball is added to the previous one.

   

   NoteTo reset Spill and Blend parameters, click the Reset button, below the Edge Balance trackball.