Creating a Custom Special Effect Filter (Convolution Effect)

You can use the Convolution filter to create your own special effects and apply them to your image.

You can save your settings as a preset for future use.

To Create a Custom Effect Filter:

  1. In Edit mode, in the Add group, select Special Effect.

    2. You can also access the Special Effects menu from the Filter drop-down menu or Filter toolbar.

  2. Click User Defined Convolution.
  3. On the User Defined Convolution panel, set the options as described below.
  4. Do one of the following:
    • Click Done to accept your changes and close the panel.
    • Click Cancel to discard your changes and close the panel.

User Defined Convolution Options

Convolution Matrix

Specifies the formula to use when altering the image.

Type numbers in the matrix fields to change the pixels in the image. Using a mathematical formula, the color value of each pixel in an image is multiplied by the numbers in the matrix to produce an effect.

Division

Specifies the fractional coefficient of the matrix.

Type a number into the Division field to use fractional coefficients in the matrix. The product of the convolution matrix is divided by the division factor before being applied to a pixel.

Bias

Specifies the brightness of the image.

Type a number into the Bias field to change the brightness of the image. The bias number is added to the RGB values of each pixel. A positive number brightens the image, while a negative number darkens the image.

Clear Matrix

Resets the matrix.

Sample Filters Drop-Down Menu

Loads a sample effect to use as a starting point for creating your own effect.

You can use the Edit Brush to paint this effect onto specific areas of your image.

You can use the Gradient tool to transition this effect across specific areas of your image.

You can use the Radial Gradient tool to apply effects around, or directly to, a center point.

See also: