FUSION · NODE REFERENCE
GrowColor
Iterative color propagation and fill
Krokodove GrowColor extends an image’s edge color into transparent regions. It is useful for preparing edges before filtering and for graphic color extension; it is not a color-similarity selection or hidden-background reconstruction.
GrowColor
Overview
What GrowColor does
GrowColor addresses color near transparent boundaries. After keying, filtering or warping, insufficient useful edge RGB may produce a dark fringe. Extending edge color is one preparation technique, but a correct source alpha and appropriate premultiplication handling remain necessary.
It does not select similar colors or reconstruct content hidden behind an object. The official brief description specifies extending existing edges into transparent areas. Test it on a title or logo with transparency instead of only a fully opaque frame.
Iterations sets the number of processing passes. Compare several values on one source while keeping other controls fixed. More passes do not guarantee a better edge; they may extend color farther than needed and increase processing cost.
The capture also shows Iteration Interrupt. It must not be described as a pause measured in seconds between frames: the official overview gives neither those units nor an exact stopping rule. For a reproducible test, retain its baseline and vary it independently from Iterations.
Lock X/Y links spatial settings in the two directions. Resolution and Iteration Exponent affect the iterative treatment, but the official overview supplies no exact formulas. Change them independently and compare edge-color reach, detail and processing time. Resolution is not the output-frame size or a guaranteed higher-detail mode.
Threshold and Threshold Softness control a processing threshold and its transition. Their names do not establish a metric of neighboring-color similarity. Compare their effect on an edge with known alpha at fixed Iterations, then inspect transparent and semitransparent regions separately.
For technical preparation, keep the original branch so you can compare edge RGB and alpha or restore the required matte in a later operation. For creative extension, process a separate graphic branch and composite it over a background. Use the documented mask input on a separate Merge to localize the composite.
The original capture confirms seven visible controls; Resolve 21 manual page 2484 confirms the purpose of Grow Color. The full socket inventory, threshold formula and actual pixel behavior still require inspection in the installed Resolve build. The lessons retain one image input and output without adding unconfirmed direct mask connectors.
When to use it
Extend useful color beyond an isolated object’s boundary before filtering.
Investigate a thin dark fringe around a transparent title or logo.
Fill transparent gaps using extended neighboring edge color when appropriate for the design.
Creatively extend color on an independent graphic branch.
Compare treatment of horizontal and vertical boundaries.
Prepare imagery for compositing with separately controlled alpha.
GrowColor in context
Screenshots referenced by this article. Open an image to inspect it at full size.
Example for GrowColor.
Original image