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blend: combine two images

this one takes the inputs and combines them to the output image. the mode of operation is controlled by the parameters mode and opacity.

current blend modes:

• over the output will be (1-opacity) * back + opacity * input
• taa use temporal anti-aliasing with box clamping and opacity as parameter
• focus stack wavelet transform both back and input and keep only the detail coefficients with larger magnitude
• multiply multiplies the back buffer and input

parameters

• mode defines the blend mode
• mask use or ignore the mask connector
• opacity some blend modes use an opacity value
• taathrs the threshold for temporal anti aliasing

connectors

• input the new top layer
• back the back buffer of the composite
• mask an optional mask used for certain blend modes. connect a dummy if you don't need it