Create colour wheels (lift/gamma/gain)
create_color_wheelsBuild a color-grading chain with lift, gamma, and gain wheels for shadows, midtones, and highlights, plus offset and saturation, to correct color tone in TouchDesigner TOPs.
Instructions
Classic colour-grading wheels — three tinted Level TOPs run in series for shadows (lift, gamma-biased), midtones (gamma) and highlights (gain, brightness-biased), then a master Level TOP for global offset (blacklevel), then an HSV Adjust TOP for saturation. Each wheel is an [r,g,b] multiplier in 0..2 (1,1,1 = neutral). Builds a new baseCOMP under parent_path holding the chain; with source_path the upstream TOP is pulled in via a Select TOP, without one a Ramp TOP test gradient is graded so the chain previews standalone. Exposes per-channel LiftR/G/B, GammaR/G/B, GainR/G/B float knobs plus Offset and Saturation (live-bound to the underlying Level/HSV pars). Output is a Null TOP. Use create_color_grade for a simpler single-Level + HSV chain, or apply_post_processing to chain several distinct effects.
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| gain | No | Highlight tint (gain wheel) as [r,g,b] in 0..2. Multiplies R/G/B on a Level TOP biased into highlights via `brightness1`. [1,1,1] = neutral. | |
| lift | No | Shadow tint (lift wheel) as [r,g,b] in 0..2. Multiplies R/G/B on a Level TOP whose `gamma1` is biased high (~1.4) so the multiply lands in the darker tonal range. [1,1,1] = neutral. | |
| gamma | No | Midtone tint (gamma wheel) as [r,g,b] in 0..2. Multiplies R/G/B on a mid-biased Level TOP. [1,1,1] = neutral. | |
| offset | No | Global black-level offset (-1..1). Positive lifts the black point (faded/filmic look); negative crushes. Drives the master Level TOP's `blacklevel`. | |
| base_name | No | Optional base name for the container (defaults to 'color_wheels'). Final container path is `<parent_path>/<base_name>` with TD's auto-suffix. | |
| saturation | No | Master saturation multiplier (1 = unchanged, 0 = greyscale). Drives the trailing HSV Adjust TOP's `saturationmult`. | |
| parent_path | No | Parent network where the colour-wheels container is created (default '/project1'). | /project1 |
| source_path | No | Absolute path of the source TOP to grade. Pulled in via a Select TOP (TD wires don't cross containers). If omitted, a Ramp TOP test gradient is graded so the chain still builds and previews without any external source. | |
| expose_controls | No | When true (default), expose live per-channel float knobs LiftR/G/B, GammaR/G/B, GainR/G/B (0..2, 1 = neutral) plus Offset and Saturation. Three floats per wheel — instead of a single RGB swatch — because the shared control-panel builder cannot bind an `rgb` control to a parameter, so the swatch would be display-only. |