Film Noise Filter (`fmns')
The Film Noise filter alters a single source, simulating some of the effects that are seen on aged film stock. This effect can be used to transform a video source into one that looks like it was shot on film that has suffered the effects of age and mishandling.
The specific features, which can be controlled independently, are:
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Hairs. These are a simulation of hairs lying on the surface of the film. Each hair is randomly generated, and is colored in a randomly chosen shade of light grey.
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Scratches. These are vertical or near-vertical one-pixel lines drawn onto the destination image which simulate scratches in the film. Each scratch lasts for a pre-calculated length of time. During its lifespan the scratch's position will be randomly peturbed. Shortly before the scratch is removed, it will begin to shorten. The color of the scratches is a randomly chosen shade of light grey.
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Dust. These simulate dust particles on the surface of the film. Dust particles are drawn using the same algorithm that generates the hairs, but the particles are more tightly curled, and drawn in a darker shade of grey.
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Film Fade. This simulates an overall change in the color of the film stock. Every pixel of the source image is passed through the film fade algorithm, so this can be processor-intensive.
The Film Noise effect takes a single source and has eight parameters.
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