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Anisotropic Kuwahara Color | Substance 3D Designer

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Anisotropic Kuwahara Color icon

In: Filters > Effects

Description

Applies an anisotropic directional blur which conforms to the details of the image. The result is an image which appears to flow in the direction of the shapes within.

This adjustable blur computes or receives a direction map to determine that flow, which can be sharpened into flatter, more clearly defined areas.

The flow may also be broken down by rotating the direction in which blurring is applied. Similarly, a custom direction map may be used to override the one computed out of the image.

This filter can produce a painterly effect, and is useful for stylization.

The intensity of the flow is mainly controlled by the Anisotropy parameter, as demonstrated in the image below.

Left: Anisotropy 0.0 / Right: Anisotropy 1.0

anisotropic_kuwahara_color_example_3_before
anisotropic_kuwahara_color_example_3_after

Input
connectors

Output
connectors

Parameters

Input connectors

Input

Color 

Primary

The color image which should be processed.

Anisotropy angle map

Grayscale

The grayscale image describing the additional rotation applied to the computed direction, where the grayscale value is a number of turns.

 

The map still has an effect when the 'Anisotropy' parameter is set to 0, as it impacts the rotation of the kernel used by the Kuwahara filter.

Slope map

Grayscale

The map representing slopes that the direction map is conformed to, according to the 'Slope Map Input Multiplier' parameter value.

Radius map (optional)

Grayscale

When connected, the blurring 'Radius' is multiplied against the input image.

Direction map

Color

The map describing the direction used by the anisotropic filter kernel.

 

The map still has an effect when the 'Anisotropy' parameter is set to 0, as it impacts the rotation of the kernel used by the Kuwahara filter.


Note: This input is only used when the 'Use Input Direction Map' parameter is set to 'True'.

Output connectors

Output

Color

The result of the anisotropic blurring applied by the node on the input image.

Direction map

Color

The direction map computed from the input image and used to drive the anisotropic blurring.

 

If the 'Use Input Direction Map' parameter is set to 'True', the image provided to the 'Direction Map' input is used and output as is.

Parameters

Radius

Float

The blurring radius, where a higher value results in a stronger blurring effect.

 

The maximum value is 32.

Smoothness

Float

Adjusts the amount of blending of colors in the computed direction.

 

When this value is 0, colors are mostly displaced in that direction and very little blending occurs.

Sharpness

Float

Increases the contrast in the blurred areas, resulting in them looking flatter and more clearly defined.

Anisotropy

Float

Adjusts the contribution of the direction map in the blurring.

 

The direction map and all its modifiers (both parameters and input maps) still have an effect when this parameter value is 0, as the direction map is used in the Kuwahara filter kernel.

Use input direction map

Boolean

When 'True', no direction map is computed from the input image, and the image connected to the 'Direction Map' input is used to drive the anisotropic blurring instead.

Tensor smoothness

Float

 

Available when 'Use input direction map' is set to 'False'

Adjusts the intensity of blurring applied to the directions computed from the image and stored in the direction map.

 

Increasing this value ensures a smoother result when the image has a lot of high frequency detail.

Anisotropy angle

Float

 

Available when 'Use input direction map' is set to 'False'

Adds a rotation to the direction map, in number of turns.

 

This additional rotation is cumulative with the one specified by the 'Anisotropy Angle Map' input.

Anisotropy angle map multiplier

Float

 

Available when 'Use input direction map' is set to 'False'

Adjusts the intensity of the values in the 'Anisotropy Angle Map' input, which are then added on top of the rotation applied to the direction map, in number of turns.

 

This additional rotation is cumulative with the one specified by the 'Anisotropy Angle' parameter.

Slope map input multiplier

Float

 

Available when 'Use input direction map' is set to 'False'

Adjusts the intensity by which the direction map is conformed to the slopes provided by the 'Slope Map' input.

Ignore alpha

Boolean

When 'True', the alpha channel of the image is not impacted by the filter.

 

When 'False', the filter is also applied to the alpha channel.

Examples

anisotropic_kuwahara_color_example_1_before
anisotropic_kuwahara_color_example_1_after
anisotropic_kuwahara_color_example_2_before
anisotropic_kuwahara_color_example_2_after
anisotropic_kuwahara_color_example_4_before
anisotropic_kuwahara_color_example_4_after

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