User Manual

Keep Aspect
When toggled on, the Crop node maintains the aspect of the input image.
Keep Centered
When toggled on, the Crop node automatically adjusts the X and Y Offset controls to keep the
image centered. The XY Offset sliders are automatically adjusted, and control over the
cropping is done with the Size sliders or the Allow Box Selection button in the viewer.
Reset Size
This resets the image dimensions to the size of the input image.
Reset Offset
This resets the X and Y Offsets to their defaults.
Change Pixel Aspect
Enable this checkbox to reveal a Pixel Aspect control that can be used to change the image’s
pixel aspect.
Clipping Mode
This option sets the mode used to handle the edges of the image when performing domain of
definition (DoD) 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 will be treated as black/transparent.
 Domain: Setting this option to Domain will respect the upstream DoD 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.
Auto Crop Tab
Auto Crop tab analyzes the selected channel and crops the image based on that channel’s
boundaries. The adjustments from auto crop are seen in the Crop tab parameters.
RGBA Color Channels
Select which channels are examined for an Auto Crop. This is useful for auto cropping images
with non-solid backgrounds in a specific color channel, like a blue color gradient. Toggling the
channel off causes Auto Crop to ignore it when evaluating the image.
Auto Crop
This evaluates the image and attempts to determine the background color. It then crops each
side of the image to the first pixel that is not that color.
Chapter – 108 Transform Nodes 2444