TYPE: COP
TITLE: Blend COP

This operations blends frames from two sequences together using a simple 
linear blend. An optional third sequence can be used to specify the blend 
factor on a per-pixel basis.

Parameters
Blend
    Blend Method       - When a third input is not attached, a global
			 blend is applied between the 2 inputs.
	Use Blend Factor  -  Out = (1-Blend) * Input1  +    Blend * Input2
	Use Blend Weights - Out =   Weight1 * Input1  +  Weight2 * Input2
    Blend Factor       - Globally blends between input one (0) and two (1).
    Input 1 Weight     - If using blend weights, this specifies the
			 factor to multiply input 1 by.
    Input 2 Weight     - This specifies the factor to multiply input 2 by.
    Normalize Weights  - If on, the weights will always be scaled to sum
			 up to 1.
    Blend Mask         - If a third input is used to control the blending,
			 this menu selects the plane or component to use
			 as the blend mask. Black is input 1, white is
			 input 2.
    Invert Blend Mask  - If on, black is input 2, while white is input 1.

Merge 
    Overview - These parameters specify how to build the output
	       sequence when there are differences between the input sequences.

    Plane Merge  - If the planes in the inputs differ, this specifies
		   what the output planes should be. 
    Raster Depth - If the raster depth for a given plane differs between
		   inputs, this specifies when the output raster depth for
		   the plane should be.
    Frame Range  - If the frame ranges of the inputs differ, this
		   determines what the output range should be.
    Frame Rate   - If the frame rates of the inputs differ, this
		   determines what the output frame rate should be.
    Frame Match  - If the frame rates of the inputs differ, this
		   determines which input frame to pick when the cook time
		   doesn't reside on a frame boundary.

Local Variables:
    L   - Sequence length
    S   - Start of sequence
    E   - End of sequence
    IL  - Input sequence length
    SR  - Sequence frame rate
    NP  - Number of planes in sequence
    W,H - Width and height of image
    I   - Image index (0 at start frame)
    IT  - Image time (0 at start frame)
    AI  - Current plane array index
    PI  - Current plane index
    PC  - Num of channels in current plane

See Also: Sequence
