Convolution Kernel

This effect changes the brightness values of each pixel in the clip according to a predefined mathematical operation known as a convolution. The Convolution Kernel Settings dialog box displays a grid that represents a pattern of pixel brightness multipliers, with the pixel being evaluated in the center of the grid. Use this filter to create custom blurs and embosses.

To specify the Convolution Kernel settings:

1 Click the center text box in the group of nine. This box represents the pixel being evaluated. Type a value (from -999 to +999) by which you want to multiply that pixel's brightness value.

2 Click a text box representing an adjacent pixel to which you want to assign a weighted value. Type the value by which you want the pixel in that position multiplied. For example, if you want the brightness value of the pixel to the right of the current pixel multiplied by 2, type 2 in the text box to the right of the center box.

3 Repeat the previous step for all pixels that you want to include in the operation. You don't need to type values in all of the text boxes.

4 In the Scale text box, type the value by which to divide the sum of the brightness values of the pixels included in the calculation.

5 In the Offset text box, type the value to be added to the result of the scale calculation. Then click OK.

The effect is applied to each pixel in the clip, one at a time.

Note: Use the Load and Save buttons in the dialog box to save convolution settings in a separate file, which you can then load for reuse in other instances of the effect.

Applying Effects > Video effects included with Premiere > Convolution Kernel