feedback - Don't erase background for visual trace in Quartz Composer -

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I do not possible to clean the background in the quartz composer?

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Present in a image within your patch, and add its output to a addition patch Connect the culture to the container patch output, and connect to the "Background Image" port with the output of Accumulator patch> > Patch, then to create a feedback loop, then add to patch Connect to Billboard .

image enhancement loop

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