Expand or adjust an image’s bounding box in Nuke by adding pixels and choosing how the new bounds are set, without changing pixel data.
Fill BBox grows or redefines the incoming bounding box while leaving the image content untouched. The result is the original stream with a new box applied.
Use it when a tight bbox clips blurs, glows, or other filters, when you need simple overscan around a plate or element, or when downstream nodes expect a larger working area than the current bounds.
Add Pixels controls how far AdjBBox expands the box after a format-sized Crop. Set bbox to chooses the Merge bbox mode that resolves the final bounds. CopyBBox then writes that box onto the original input so channels pass through unchanged.