FUSION · NODE REFERENCE
InvertColor
Independent RGBA channel inversion
Resolve FX InvertColor inverts selected Red, Green, Blue and Alpha channels. Color inversion and transparency changes are separate tasks; explicitly verify the enabled switches.
InvertColor
Overview
What InvertColor does
The official Resolve FX Color entry distinguishes simple inversion from negative-film processing. Channel switches can create a digital effect; scanned negatives require additional color transforms and a stock-specific workflow.
The original Inspector shows Red, Green and Blue enabled and Alpha disabled. This is the captured state, not a required preset for every source. For channel testing, disable all four, then enable one at a time and inspect the corresponding Viewer channel.
Alpha controls transparency independently of the RGB appearance. Inverting A can expose areas without useful color information and hide previously opaque regions. It does not paint missing edges, reconstruct a background or itself establish a correct premultiplication workflow.
To obtain a matte from inverted alpha, leave RGB disabled, invert A, then extract Alpha through Bitmap. Merge’s blue port receives Bitmap.Mask; the InvertColor output remains an image. An existing Bitmap or Rectangle may offer a simpler local Invert switch.
To change part of a frame, route the clean branch to Merge Background, the processed branch to Foreground and Rectangle to Effect Mask. This localization does not depend on unverified extra Resolve FX wrapper sockets. With semitransparent sources, also inspect alpha accumulation during compositing.
A normalized numeric check is useful on a simple color chart, but record the processing space and signal range. This guide does not claim exact HDR, negative-value or rounding behavior for a specific build; those checks remain native validation.
When to use it
Verify each switch explicitly and distinguish channel inversion from selecting colored objects.
Extract inverted alpha from a transparent title and use it to control a visible layer with valid RGB.
Retain the source outside a region and limit RGB inversion with a Merge mask.
InvertColor in context
Screenshots referenced by this article. Open an image to inspect it at full size.
Example for InvertColor.
Original image