Command entry:Tools menu Viewport Canvas Activate any paint tool or click Layers Dialog. Layers dialog Menu bar Filter menu

Choosing a Filter menu item opens a modal dialog that lets you change settings with sliders and (for Blur) radio buttons. Each dialog has a Preview switch that’s on by default so you can view the effect immediately on the painted surface.

Blur

Opens a dialog that lets you specify the amount and direction of blur to apply to the layer.

• BlurThe amount of blurring to apply.
• UniformBlurs equally in all directions.
• HorizontalBlurs horizontally only.
• VerticalBlurs vertically only.

Sharpen

Applies a sharpening effect by adjusting the contrast between pixels at edges in the image.

• AmountThe degree of sharpening applied.
• RadiusThe distance from each affected pixel within which neighboring pixels are affected by the sharpening.
• ThresholdThe contrast at edge pixels required for sharpening to occur. At higher values, less sharpening is applied.

Find Edges

Emphasizes edges and de-emphasizes color and midtones. The output tends to resemble a sketch with black ink on white paper.

• ThresholdThe contrast at edge pixels required for edge detection to occur. At higher values, fewer midtones appear.
• ContrastThe contrast at edges for detection to occur. At higher values, fewer midtones appear.

Median

Reduces image noise without affecting sharpness.

• RadiusThe distance within which noise reduction occurs. Lower values tend to be more effective.

Threshold

Converts a color image to black-and-white.

• ThresholdAt lower values, pixels tend to become white, while
• SmoothnessApplies a blurring or averaging effect.
• GradientLower values produce high-contrast output, while higher values tend toward grayscale output.

High Pass

Emphasizes edges near sharp color transitions and de-emphasizes the remainder of the image. This can be useful for preserving image detail before using the Threshold filter (see preceding).

• RadiusThe area in which the filter looks for color contrast. The higher this value, the less filtration is performed.

Distort

Adds “wavy” distortion to the image.

• OffsetThe distance pixels move along the distorting waveforms.
• ScaleThe relative size of the distorting waveforms.
• IterationsThe number of times the distortion is applied to the image.
• PhaseThe relative position of the distorting waveforms.