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This filter is designed to isolate the edges of color banding and minimize them by dithering pixels from either side to soften the transition. This filter works best when applied to regions of the image that have been isolated with a secondary qualifier or window, otherwise you risk all edges within your image being dithered and thus softened (although this can be an interesting stylistic effect).
Deband Parameters
Deband controls include:
— Edge Threshold: Adjusts how well-defined an edge needs to be in order to be affected by this filter; lowering this excludes fainter edges, while raising this includes them.
— Radius: Lowers or raises the intensity of dithering in areas that will be affected.
— Post Refine: Narrows (by lowering) or widens (by raising) the areas affected by dithering.
— Display Edge: A checkbox that shows you a black and white high-contrast preview of which edges are being detected for dithering, which can help you fine-tune your results.
Deflicker (Studio Version Only)
The Deflicker plugin handles such diverse issues as flickering exposure in timelapse clips, flickering fluorescent lighting, flickering in archival film sources, and in certain subtle cases even the “rolling bars” found on video screens shot with cameras having mismatched shutter speeds. Two key aspects to this filter are that it only targets rapid, temporally unstable variations in lightness, and that it’s able to target only the areas of an image where flickering appears, leaving all other parts of the image untouched. As a result, this plugin can often repair problems once considered “unfixable.”
(Left) Original image with flicker bars in the blue screen,
(Right) Result setting Deflicker to Fluoro Light, (clip courtesy Redline Films)
Main Parameters
By default, the top section of this plugin exposes a single control, which in many cases may be all you need.
— Deflicker Settings pop-up menu: The top two options, Timelapse and Fluoro Light, are presets that effectively eliminate two different categories of flickering artifacts. If neither of these presets is quite as effective as you’d hoped, a third option, Advanced Controls, opens up the Isolate Flicker controls at the heart of this plugin to let you tailor it further to your needs.