Filter Menu
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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.


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.

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.

Reduces image noise without affecting sharpness.

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

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.

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.