User Manual

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.
Common Controls
Settings Tab
The Settings tab in the Inspector is also duplicated in other Blur nodes. These common controls
are described in detail at the end of this chapter in “The Common Controls” section.
Glow [GLO]
The Glow node
Glow Node Introduction
A Glow is created by blurring an image, and then brightening the blurred result and mixing it
back with the original. The Glow node provides a variety of variations on this theme. For
example, a Bartlett glow is a high-quality glow with a smoother drop-off; however, it is more
processor-intensive at larger sizes.
Inputs
The Glow node has three inputs: an orange one for the primary 2D image input, a blue one for
an effect mask, and a third white input for a Glow mask.
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Input: The orange input is used for the primary 2D image that has the glow applied.
–
Effect Mask: The blue input is for a mask shape created by polylines, basic primitive
shapes, paint strokes, or bitmaps from other tools. Connecting a mask to this input
restricts the source of the glow to only those pixels within the mask. An effect mask
is applied to the tool after it is processed.
–
Glow Mask: The Glow node supports pre-masking using the white glow mask
input. A Glow pre-mask filters the image before applying the glow. The glow is then
merged back over the original image. This is different from a regular effect mask that
clips the rendered result.
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