Resolume Luma Keyer
Luma keyer for Resolume
What it does
A luminance keyer effect for Resolume Arena and Avenue, built on the official Resolume FFGL SDK. It measures the perceptual Rec. 709 luminance of each pixel and drives that pixel's alpha from it, so dark — or bright — areas of an incoming clip become transparent and let lower layers show through.
A quick way to key a black background, composite add-blend-style content, or pull a shadow or highlight matte, without needing a dedicated key colour.
Also available as an OpenFX plugin for DaVinci Resolve, Vegas Pro, Nuke and Natron — the identical key, rendered on the CPU from the same maths as the GLSL, shipped as its own download alongside the FFGL build.
Newest of the builds: an After Effects plugin, which Premiere Pro loads too — the same key from the same repository, shipped per platform as its own download and labelled beta while it earns the host time the other builds have had.
- Threshold — the luma level at the centre of the key edge; pixels darker than it are keyed out
- Softness — the width of the soft edge, from a hard cut to a gradual falloff
- Invert — remove bright pixels instead of dark ones
- Works on straight colour internally and outputs premultiplied, clamped to LDR, matching Resolume's pipeline
- Universal macOS bundle, a Windows DLL, and an OpenFX bundle for macOS, Windows and Linux
Where it stands
Released at v1.3.5. The two point releases since changed nothing in the picture: v1.3.4 shipped a Windows installer that no longer touches the system PATH — the earlier one could overwrite it — and v1.3.5 gives the effect a real description in the field Resolume shows for it. The OpenFX build for Resolve, Vegas, Nuke and Natron, and the After Effects and Premiere Pro build alongside the FFGL one, both arrived in v1.2.0; v1.3.3 added a Linux OpenFX build, proven to load on Rocky 8 in CI. Needs Resolume Arena or Avenue 7.3.1 or newer. It has been run inside Resolume on real content. The before/after image is still rendered with the plugin's exact shader maths rather than captured from Resolume.