Deband Removes banding artifacts from a clip by diffusing pixels across the banded areas, while keeping the original edges intact. To use this effect, first select Show:Edges and adjust the edge threshold until the banding edges just disappear, leaving only the desired real edges. Then select Show:Result to see the result. If you still see some banding, increase Diffuse Threshold and/or Diffuse Radius. Inputs: Source:  The clip to be processed.

Parameters:

Edge Threshold:   Default: 2,  Range: 0 to 255.
The amount by which adjacent pixels must differ to constitute a real desired edge. A value of 1.0 represents the smallest possible difference at 8 bits. This parameter should be set high enough that none of the bands appear as edges, but low enough that all the real edges are still detected.

Grow Edges:   Default: 0,  Range: 0 or greater.
Amount to grow the detected edges in approximate pixels. Increasing this parameter can prevent diffusion in areas that are near edges, but not on an edge.

Show:   Popup menu,  Default: RESULT.
Selects the type of output.

RESULT:  Shows the final result.

EDGES:  Shows the edges of the image, where adjacent pixels differ by more than Edge Threshold. Use this mode to help fine-tune the edge detection parameters.

Diffuse Thresh:   Default: 1,  Range: 0 or greater.
The maximum color difference allowed when diffusing pixels. This parameter is automatically scaled by the edge threshold. Increasing it can give better results when there is a gradient within the bands. Decreasing it will reduce diffusion in areas where there are no edges.

Diffuse Radius:   Default: 12,  Range: 0 or greater.
The maximum radius of pixel diffusion, in approximate pixels. A larger value will remove banding more effectively in large areas with uniform colors, while a smaller value will give a better result in areas with many small color regions.

Pre Blur:   Default: 0,  Range: 0 or greater.
Blurs the source before diffusing pixels.

Post Blur:   Default: 0.5,  Range: 0 or greater.
Blurs the result after diffusing pixels. Use this parameter to reduce noisiness in the result.

See Also:

GrainRemove

Sapphire Plug-ins Introduction

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