Rack Focus replicates a true camera defocus by introducing lens Bokeh effects. Bokeh is the Japanese term that describes the quality of out-of-focus points of light. In defocused areas, each point of light becomes a shape--either a circle or a polygon. The shape grows in size as the amount of defocusing is increased.

Diffusion.

To select a preset, choose one from the Presets tab.

The image is blurred by using a quality blur.

Determines the blend mode to be used when adding Bokeh.

Bokeh’s are added to your image.

The Bokeh are combined with the image using a Screen blend mode. This looks kind of like the Add blend mode, but highlights are retained.

Brightens the Bokeh.

Set the number of Bokeh facets when the Curvature parameter is set to 0.

Controls the curvature of the Bokeh. When set to 100, the Bokeh are completely round. Set to a value of 0 to see a polygonal shape.

Rotates the Bokeh.

Sets the Bokeh color.

Sets the softness of the Bokeh. This can be useful when using high threshold values.

A matte is used to create the Bokeh effect. Go to the Matte section of Common Node Controls to see how the Matte controls work.