Frequency Blur

The Frequency Blur plugin applies blurring to an image in Fourier space. This allows arbitrarily shaped blurring kernels and processing speeds that are independent of the blur size.

Overview

The image is blurred using either an internal or user-defined blur kernel. The internal blur kernel support disc, polygon, gaussian, and airy disk shaped kernels. In addition, the disc and polygon kernels support bad bokeh (dark center with bright border) effects. The plugin supports both convolution (blur) and deconvolution (sharpen) of an image using the defined kernel.

Inputs

• Apply the mask as a convolution or deconvolution
• Handle edges using a duplicating, wrapping, or black edge policy
• Define filter sizes relative to image size or using absolute pixel widths
• Generate the mask internally using the disk, polygon, gaussian, airy disk, or laplacian style
• Control blur size for each color channel independently (Frequency Blur 2)
• Adjust internal kernel parameters using the bad bokeh and kernel angle
• Use the plugins second input to add a user-defined kernel
• Adjust the blur size to increase the size of either the internal or user-defined kernel

Results

A cropped headlight from the Mini image
A disk blur of size 5.0	A disk blur of size 5.0 with a bad bokeh of 1.0
A hex blur of size 5.0	A hex blur of size 5.0 with a bad bokeh of 1.0