User Manual

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Fast Gaussian: Fast Gaussian adds a soft glow, blurred by the Gaussian algorithm. This
is the default method.
Blend: Blend adds a nonlinear glow that is evenly visible in the whites and blacks.
Hilight: Hilight adds a glow without creating a halo in the surrounding pixels.
Solarize: Solarize adds a glow and solarizes the image.
Color Channels (RGBA)
This filter defaults to operating on R, G, B, and A channels. Selective channel filtering is possible
by clicking each channel to make them active or inactive.
NOTE: This is not the same as the RGBA checkboxes found under the common
controls. The node takes these selections into account before it processes the image,
so deselecting a channel causes the node to skip that channel when processing,
speeding up the rendering of the effect. In contrast, the channel controls under the
Common Controls tab are applied after the node has processed.
Lock X/Y
When Lock X/Y is checked, both the horizontal and vertical glow amounts are locked.
Otherwise, separate amounts of glow may be applied to each axis.
Glow Size
Glow Size determines the size of the glow effect. Larger values expand the size of the glowing
highlights of the image.
Num Passes
Only available in Multi-box mode. Larger values lead to a smoother distribution of the effect, but
also increase render times. It’s good to find the line between desired quality and acceptable
render times.
Glow
The Glow slider determines the intensity of the glow effect. Larger values tend to completely
blow the image out to white.
Clipping Mode
This option determines how edges are handled when performing domain-of-definition
rendering. This is profoundly important for nodes like Blur, which may require samples from
portions of the image outside the current domain.
Frame: The default option is Frame, which automatically sets the node’s domain of
definition to use the full frame of the image, effectively ignoring the current domain
of definition. If the upstream DoD is smaller than the frame, the remaining area in the
frame is treated as black/transparent.
Domain: Setting this option to Domain respects the upstream domain of definition
when applying the node’s effect. This can have adverse clipping effects in situations
where the node employs a large filter.
None: Setting this option to None does not perform any source image clipping at all.
This means that any data required to process the node’s effect that would normally be
outside the upstream DoD is treated as black/transparent.
Chapter – 84 Blur Nodes 1831