<!-- Generated by tools/build_node_reference.py from the node definitions. Do not edit by hand. -->

# Color nodes

White balance, CDL, curves, LUTs, OCIO, grades, and color checks.

18 nodes. [All sections](README.md)

- [Apply Grade Info](#apply-grade-info)
- [ARRI Wide Gamut 4](#arri-wide-gamut-4)
- [Bake Viewer Grade](#bake-viewer-grade)
- [CDL](#cdl)
- [CDL Export](#cdl-export)
- [CDL Import](#cdl-import)
- [ColorCorrect](#colorcorrect)
- [ColorLookup](#colorlookup)
- [DaVinci Wide Gamut](#davinci-wide-gamut)
- [Grade](#grade)
- [Grade Match](#grade-match)
- [HDR Color Convert](#hdr-color-convert)
- [HueCorrect](#huecorrect)
- [LUT](#lut)
- [LUT Blend](#lut-blend)
- [OCIO ColorSpace](#ocio-colorspace)
- [OCIO Context](#ocio-context)
- [White Balance](#white-balance)

## Apply Grade Info

`RadianceApplyGradeInfo`

Apply a saved grade_info JSON to any image.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Image to grade, processed in its own encoding (the grade is plain arithmetic, not colour-managed). Single-channel images are expanded to RGB. |
| `grade_info` | string |  |  | grade_info JSON from Radiance Grade or Grade Match (lift, gamma, gain, offset lists plus contrast, pivot, saturation). Missing keys fall back to neutral; invalid JSON passes the image through unchanged. |
| `strength` (optional) | float | 1 | 0 to 1, step 0.05 | Mix between the original image (0) and the fully graded result (1). |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |
| `grade_info` | STRING |

## ARRI Wide Gamut 4

`RadianceARRIWideGamut4`

Convert to/from ARRI Wide Gamut 4 (AWG4) for Alexa 35.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Linear image in the space named on the left of the chosen direction. Remove any LogC4 encoding first: this node converts primaries only. |
| `direction` | choice | `AWG4 to ACEScg` | `AWG4 to ACEScg`, `ACEScg to AWG4`, `AWG4 to Linear sRGB`, `Linear sRGB to AWG4` | Primaries conversion to run, linear in and linear out. ACEScg options include a Bradford D65 to D60 white adaptation. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |

## Bake Viewer Grade

`RadianceGradeApply`

Bakes Radiance grading math into the image tensor permanently.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Image to grade, treated as linear Rec.709/sRGB primaries. The result is not clamped (values above 1.0 are kept); NaN and Inf are zeroed or capped. |
| `exposure` | float | 0 | -10 to 10, step 0.01 | Exposure in stops, baked into the output: RGB is multiplied by 2^exposure before every other control. |
| `offset` | float | 0 | -1 to 1, step 0.001 | Additive brightness lift applied after exposure. Shifts all tones uniformly. |
| `lift` | float | 0 | -1 to 1, step 0.001 | Shadow lift (black point raise). Raises the darkest values without affecting highlights. |
| `gamma` | float | 1 | 0.01 to 4, step 0.01 | Mid-tone power curve, applied as x^(1/gamma) to positive values. Values > 1.0 brighten, < 1.0 darken the midtones. |
| `gain` | float | 1 | 0 to 10, step 0.01 | RGB multiplier (slope), applied after lift. 1.0 = no change. |
| `contrast` | float | 1 | 0 to 4, step 0.01 | Linear contrast around pivot: (x - pivot) x contrast + pivot, per channel. Not an S-curve, so values can go negative or above 1.0. |
| `pivot` | float | 0.18 | 0 to 1, step 0.01 | Value left unchanged by contrast. 0.18 = 18% grey in linear light. |
| `shadows` | float | 0 | -1 to 1, step 0.01 | Shadow brightness, no tint: RGB is scaled by 1 + 0.5 x shadows x (1 - luma)^2. Positive brightens dark areas, negative darkens them. |
| `highlights` | float | 0 | -1 to 1, step 0.01 | Highlight brightness, no tint: RGB is scaled by 1 + 0.5 x highlights x luma^2 (luma clipped to 1). Positive brightens bright areas, negative darkens them. |
| `saturation` | float | 1 | 0 to 5, step 0.01 | Global colour saturation. 1.0 = original, 0.0 = monochrome, > 1.0 = boosted. |
| `temperature` | float | 6500 | 2000 to 12000, step 10 | White balance in absolute Kelvin, 6500 = no change. RGB is multiplied by the blackbody colour of this temperature: lower values warm the image, higher cool it. |
| `hue_shift` | float | 0 | -180 to 180, step 0.1 | Global hue rotation in degrees. 0 = no change, 180 = complementary hues. |
| `lut_name` | choice | `None` | `None`, `sRGB (Display)`, `Rec.709 (Broadcast)`, `Filmic (Cinematic)`, `Reinhard Tonemap`, `ACES Filmic`, `LogC3 (ARRI EI800)`, `LogC4 (ARRI Alexa 35)`, `F-Log2 (Fujifilm)`, `C-Log3 (Canon)`, and 17 more | Built-in transform applied last, after the grade: display/tone-map curves, linear-to-camera-log encodes, log-to-linear IDTs, or analysis views (False Color, Clip Check). None and the separator do nothing. |
| `lut_intensity` | float | 1 | 0 to 1, step 0.01 | Blend strength of the selected lut_name. 0.0 = bypass, 1.0 = full LUT application. |
| `color_science` | choice | `Linear (sRGB)` | `Linear (sRGB)`, `ACEScct` | Space for offset, lift, gamma and gain. ACEScct converts linear sRGB to ACEScct, applies them there and converts back; the other controls stay linear. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |

## CDL

`RadianceCDLTransform`

Apply an ASC CDL (Slope/Offset/Power/Saturation) colour transform.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Image to grade. The CDL maths is applied to the values as they arrive (no colour space conversion), so feed it the encoding the CDL was authored in. |
| `slope_r` | float | 1 | 0 to 4, step 0.01 | Red channel slope (gain). 1.0 = unity. |
| `slope_g` | float | 1 | 0 to 4, step 0.01 | Green channel slope (gain). 1.0 = unity. |
| `slope_b` | float | 1 | 0 to 4, step 0.01 | Blue channel slope (gain). 1.0 = unity. |
| `offset_r` | float | 0 | -1 to 1, step 0.001 | Red channel offset. 0.0 = no shift. |
| `offset_g` | float | 0 | -1 to 1, step 0.001 | Green channel offset. 0.0 = no shift. |
| `offset_b` | float | 0 | -1 to 1, step 0.001 | Blue channel offset. 0.0 = no shift. |
| `power_r` | float | 1 | 0.01 to 4, step 0.01 | Red channel power (gamma). |
| `power_g` | float | 1 | 0.01 to 4, step 0.01 | Green channel power (gamma). |
| `power_b` | float | 1 | 0.01 to 4, step 0.01 | Blue channel power (gamma). |
| `saturation` | float | 1 | 0 to 4, step 0.01 | Global saturation. 1.0 = unity. |
| `cdl_data` (optional) | string |  |  | JSON CDL data from Radiance CDL Import. When connected, its slope, offset, power and saturation values replace the sliders above. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |
| `cdl_info` | STRING |

## CDL Export

`RadianceCDLExport`

Export current CDL values to an ASC-compliant .cdl or .cc file.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `file_path` | string | `grading/shot_01_output.cdl` |  | Destination .cdl path. A relative path is written under ComfyUI's output/ folder; absolute paths are used as given. |
| `slope_r` | float | 1 | 0 to 4, step 0.001 | Red slope (gain) written to the file. 1.0 = unity. |
| `slope_g` | float | 1 | 0 to 4, step 0.001 | Green slope (gain) written to the file. 1.0 = unity. |
| `slope_b` | float | 1 | 0 to 4, step 0.001 | Blue slope (gain) written to the file. 1.0 = unity. |
| `offset_r` | float | 0 | -1 to 1, step 0.0001 | Red offset written to the file. 0.0 = no shift. |
| `offset_g` | float | 0 | -1 to 1, step 0.0001 | Green offset written to the file. 0.0 = no shift. |
| `offset_b` | float | 0 | -1 to 1, step 0.0001 | Blue offset written to the file. 0.0 = no shift. |
| `power_r` | float | 1 | 0.01 to 4, step 0.001 | Red power (exponent) written to the file. 1.0 = unity. |
| `power_g` | float | 1 | 0.01 to 4, step 0.001 | Green power (exponent) written to the file. 1.0 = unity. |
| `power_b` | float | 1 | 0.01 to 4, step 0.001 | Blue power (exponent) written to the file. 1.0 = unity. |
| `saturation` | float | 1 | 0 to 4, step 0.001 | Saturation written to the file's SaturationNode. 1.0 = unity. |
| `cdl_data` (optional) | string |  |  | JSON CDL data (from CDL Import or the cdl_info output of CDL Transform). When connected, its values replace the sliders above. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `file_path` | STRING |

## CDL Import

`RadianceCDLImport`

Import an ASC CDL (.cdl / .cc / .ccc) file into pipeline metadata.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `file_path` | string | `grading/shot_01.cdl` |  | Path to a .cdl, .cc, or .ccc file. A relative path is looked for in ComfyUI's input/ then output/ folder; absolute paths are used as given. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `cdl_data` | STRING |
| `slope_r` | FLOAT |
| `slope_g` | FLOAT |
| `slope_b` | FLOAT |
| `offset_r` | FLOAT |
| `offset_g` | FLOAT |
| `offset_b` | FLOAT |
| `power_r` | FLOAT |
| `power_g` | FLOAT |
| `power_b` | FLOAT |
| `saturation` | FLOAT |

## ColorCorrect

`RadianceFloat32ColorCorrect`

Professional 32-bit color correction with exposure, contrast, saturation, gamma, and per-channel lift/gain controls.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Input image to color correct. Processed in 32-bit float precision. |
| `exposure` | float | 0 | -10 to 10, step 0.1 | Exposure adjustment in stops. +1 = double brightness, -1 = half brightness. |
| `contrast` | float | 1 | 0 to 4, step 0.05 | Contrast multiplier around mid-gray (0.18 in linear). >1 = more contrast, <1 = less. |
| `brightness` | float | 0 | -1 to 1, step 0.01 | Additive brightness offset. Applied last so it works in the final output space. |
| `saturation` | float | 1 | 0 to 3, step 0.05 | Color saturation. 0 = grayscale, 1 = original, >1 = boosted. |
| `gamma` (optional) | float | 1 | 0.1 to 4, step 0.01 | Gamma correction: values are raised to 1/gamma. >1 = brighten midtones, <1 = darken. Sign-preserving for HDR. |
| `lift_r` (optional) | float | 0 | -0.5 to 0.5, step 0.01 | Value added to the red channel at every level, applied first, so exposure and gain then scale it. A flat offset, not a shadow-weighted lift. |
| `lift_g` (optional) | float | 0 | -0.5 to 0.5, step 0.01 | Value added to the green channel at every level, applied first, so exposure and gain then scale it. A flat offset, not a shadow-weighted lift. |
| `lift_b` (optional) | float | 0 | -0.5 to 0.5, step 0.01 | Value added to the blue channel at every level, applied first, so exposure and gain then scale it. A flat offset, not a shadow-weighted lift. |
| `gain_r` (optional) | float | 1 | 0 to 2, step 0.01 | Red channel gain (multiplier). Applied after lift, before contrast. |
| `gain_g` (optional) | float | 1 | 0 to 2, step 0.01 | Green channel gain (multiplier). Applied after lift and exposure, before contrast. |
| `gain_b` (optional) | float | 1 | 0 to 2, step 0.01 | Blue channel gain (multiplier). Applied after lift and exposure, before contrast. |
| `luma_space` (optional) | choice | `Rec.709 / sRGB` | `Rec.709 / sRGB`, `ACEScg / AP1`, `Rec.2020` | Luminance weights for saturation. Match your working colorspace. |
| `clamp_output` (optional) | boolean | off |  | Clamp output to [0,1]. OFF = HDR pass-through (preserves super-whites/negatives). |

**Outputs**

| Output | Type | What it is |
| :--- | :--- | :--- |
| `image` | IMAGE | Color corrected image in 32-bit float. |

## ColorLookup

`RadianceCurves`

RGB curve grading with piecewise-linear control points: a master curve on all three channels, then per-channel red, green and blue curves. Values beyond the end points are extrapolated along the last segment, so HDR values are not clipped.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Image to grade. Curves act on the values as they arrive, so point positions are in that encoding (0 to 1 for display-referred sRGB). |
| `master` | string | `[[0.0,0.0],[0.25,0.25],[0.5,0.5],[0.75,0.75],[1.0,1.0]]` |  | JSON list of [in, out] points applied to R, G and B before the per-channel curves. The default diagonal is identity. |
| `red` | string | `[[0.0,0.0],[0.25,0.25],[0.5,0.5],[0.75,0.75],[1.0,1.0]]` |  | JSON list of [in, out] points for the red channel, applied after the master curve. The default diagonal is identity. |
| `green` | string | `[[0.0,0.0],[0.25,0.25],[0.5,0.5],[0.75,0.75],[1.0,1.0]]` |  | JSON list of [in, out] points for the green channel, applied after the master curve. The default diagonal is identity. |
| `blue` | string | `[[0.0,0.0],[0.25,0.25],[0.5,0.5],[0.75,0.75],[1.0,1.0]]` |  | JSON list of [in, out] points for the blue channel, applied after the master curve. The default diagonal is identity. |
| `strength` | float | 1 | 0 to 1, step 0.01 | Mix between the input (0) and the fully curved result (1). |
| `grade_info_in` (optional) | string |  |  | Upstream grade metadata. Not used for the grade; it is stored as the 'upstream' field of the grade_info output. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |
| `grade_info` | STRING |

## DaVinci Wide Gamut

`RadianceDaVinciWideGamut`

Convert to/from DaVinci Wide Gamut and DaVinci Intermediate.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Image in the space named on the left of the chosen transform. 'Linear' means linear Rec.709/sRGB primaries, not display-encoded sRGB. |
| `transform` | choice | `Linear to DaVinci WG` | `Linear to DaVinci WG`, `DaVinci WG to Linear`, `Linear to DaVinci Intermediate`, `DaVinci Intermediate to Linear`, `DaVinci WG to ACEScg`, `ACEScg to DaVinci WG` | Conversion to run. The DaVinci WG options change primaries only (linear in, linear out); the Intermediate options also apply or remove the DaVinci Intermediate log curve. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |

## Grade

`RadianceGrade`

Professional color grading with per-channel Lift/Gamma/Gain/Offset, Contrast, Saturation, cinematic presets, optional grade matching, and JSON preset file loading.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Input image to grade. |
| `preset` | choice | `None (Custom)` | `None (Custom)`, `Cinematic Teal & Orange`, `Bleach Bypass`, `Cross Process`, `Film Noir`, `Vintage Film`, `Cool Blue Hour`, `Golden Hour`, `Matrix Green`, `High Key Bright`, and 3 more | Built-in look. Its lift/gamma/gain/offset/contrast/saturation values are blended with the manual sliders by preset_strength; pivot is not part of a preset. None (Custom) uses the sliders only. |
| `preset_strength` | float | 1 | 0 to 1, step 0.05 | Mix between the manual slider values (0) and the preset values (1). At 1.0 a selected preset fully replaces the manual lift/gamma/gain/offset/contrast/saturation sliders. |
| `reference_image` (optional) | IMAGE |  |  | Optional reference image for automatic grade matching. |
| `match_strength` (optional) | float | 1 | 0 to 1, step 0.05 | How far gain and offset are pulled toward the values derived from reference_image (0 = off, 1 = full). Only used when a reference image is connected. |
| `preset_file` (optional) | string |  |  | Optional path to a JSON file of presets, keyed by name, using the same fields as the built-ins. It is merged over the built-ins, so it can only redefine a preset already listed in the preset menu. |
| `lift_r` (optional) | float | 0 | -1 to 1, step 0.001 | Value added to the red channel before gain (so it is scaled by gain). A flat additive offset, not a shadow-weighted lift. |
| `lift_g` (optional) | float | 0 | -1 to 1, step 0.001 | Value added to the green channel before gain (so it is scaled by gain). A flat additive offset, not a shadow-weighted lift. |
| `lift_b` (optional) | float | 0 | -1 to 1, step 0.001 | Value added to the blue channel before gain (so it is scaled by gain). A flat additive offset, not a shadow-weighted lift. |
| `gamma_r` (optional) | float | 1 | 0.01 to 5, step 0.001 | Power applied to the red channel after lift, gain and offset: out = in^(1/gamma), sign preserved. Above 1.0 brightens mid-tones, below 1.0 darkens them; 1.0 is neutral. |
| `gamma_g` (optional) | float | 1 | 0.01 to 5, step 0.001 | Power applied to the green channel after lift, gain and offset: out = in^(1/gamma), sign preserved. Above 1.0 brightens mid-tones, below 1.0 darkens them; 1.0 is neutral. |
| `gamma_b` (optional) | float | 1 | 0.01 to 5, step 0.001 | Power applied to the blue channel after lift, gain and offset: out = in^(1/gamma), sign preserved. Above 1.0 brightens mid-tones, below 1.0 darkens them; 1.0 is neutral. |
| `gain_r` (optional) | float | 1 | 0 to 5, step 0.001 | Multiplier on the red channel, applied after lift. 1.0 is neutral, 0 is black; values above 1.0 can push HDR highlights higher. |
| `gain_g` (optional) | float | 1 | 0 to 5, step 0.001 | Multiplier on the green channel, applied after lift. 1.0 is neutral, 0 is black; values above 1.0 can push HDR highlights higher. |
| `gain_b` (optional) | float | 1 | 0 to 5, step 0.001 | Multiplier on the blue channel, applied after lift. 1.0 is neutral, 0 is black; values above 1.0 can push HDR highlights higher. |
| `offset_r` (optional) | float | 0 | -1 to 1, step 0.001 | Value added to the red channel after gain (not scaled by gain), shifting the whole channel up or down in the image's own encoding. |
| `offset_g` (optional) | float | 0 | -1 to 1, step 0.001 | Value added to the green channel after gain (not scaled by gain), shifting the whole channel up or down in the image's own encoding. |
| `offset_b` (optional) | float | 0 | -1 to 1, step 0.001 | Value added to the blue channel after gain (not scaled by gain), shifting the whole channel up or down in the image's own encoding. |
| `contrast` (optional) | float | 1 | 0 to 3, step 0.01 | Linear contrast around pivot: out = (in - pivot) * contrast + pivot, applied after gamma. 1.0 is neutral, 0 flattens everything to the pivot value. |
| `pivot` (optional) | float | 0.5 | 0 to 1, step 0.01 | Grey level that contrast rotates around, in the image's own encoding (0.5 suits display-referred sRGB; scene-linear mid-grey is about 0.18). |
| `saturation` (optional) | float | 1 | 0 to 3, step 0.01 | Saturation relative to Rec.709 luma, applied last. 1.0 is neutral, 0 is monochrome, above 1.0 increases colourfulness. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |
| `grade_info` | STRING |

## Grade Match

`RadianceGradeMatch`

Match source image color statistics to a reference image using LAB mean/std matching.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `source` | IMAGE |  |  | Image to be matched. |
| `reference` | IMAGE |  |  | Target image. |
| `strength` | float | 1 | 0 to 1, step 0.05 | Mix of the derived gain and offset against neutral (0 = no change, 1 = full match). The match is an approximation built from LAB mean and standard deviation. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `matched_image` | IMAGE |
| `grade_info` | STRING |

## HDR Color Convert

`RadianceHDRColorConvert`

GPU-accelerated color space conversion (sRGB, ACEScg, ACEScct, Rec.2020, DCI-P3). Uses industry-standard matrices.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Image encoded as source_space. |
| `source_space` | choice | `sRGB` | `sRGB`, `Linear_sRGB`, `ACEScg`, `ACEScct`, `ACES2065-1`, `Rec709`, `Rec2020`, `DCI-P3`, `Display_P3`, `DaVinci Wide Gamut`, and 2 more | Encoding of the input. sRGB and Rec709 are decoded with the sRGB curve and ACEScct with its log curve; every other option is treated as linear with those primaries. |
| `target_space` | choice | `ACEScg` | `sRGB`, `Linear_sRGB`, `ACEScg`, `ACEScct`, `ACES2065-1`, `Rec709`, `Rec2020`, `DCI-P3`, `Display_P3`, `DaVinci Wide Gamut`, and 2 more | Encoding of the output. sRGB and Rec709 get the sRGB curve and ACEScct its log curve; every other option is written linear with those primaries. |
| `exposure` (optional) | float | 0 | -10 to 10, step 0.01 | Exposure adjustment in stops (EV) |
| `gamma_adjust` (optional) | float | 1 | 0.1 to 5, step 0.01 | Gamma adjustment (1.0 = no change) |
| `chromatic_adaptation` (optional) | choice | `Bradford` | `Bradford`, `Von Kries`, `XYZ Scaling`, `None` | Chromatic adaptation method. NOTE: the D60<->D65 adaptation is already baked into the precomputed FAST_MATRICES this node converts with (Bradford), so changing this does not currently alter the output. Kept for workflow compatibility; selecting a non-Bradford method logs a warning. |
| `use_gpu` (optional) | boolean | on |  | Run the effect on GPU via CUDA/MPS. Falls back to CPU if unavailable. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |

## HueCorrect

`RadianceHueCurves`

Per-hue selective colour adjustment: a piecewise-linear curve over hue shifts hue, saturation or lightness of the colours it targets. HDR values above 1.0 are scaled down for the HSL maths and restored afterwards.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Image to adjust, RGB in any encoding. Pixels with luma above 1.0 are normalised for the HSL conversion and rescaled afterwards. |
| `mode` | choice | `Hue vs Hue` | `Hue vs Hue`, `Hue vs Saturation`, `Hue vs Luminance` | What the curve's output changes for each input hue: hue rotation, HSL saturation, or HSL lightness. |
| `control_points` | string | `[[0.0,0.0],[0.167,0.0],[0.333,0.0],[0.5,0.0],[0.667,0.0],[0.833,0.0],[1.0,0.0]]` |  | JSON list of [hue, amount] points, hue 0 to 1 (0 red, 0.333 green, 0.667 blue, 1 red again). Amount is added: hue shift in turns, or a saturation or lightness delta; 0 everywhere (the default) changes nothing. |
| `strength` | float | 1 | 0 to 2, step 0.01 | Multiplier on the curve's amounts. 0 = no change, 1 = as drawn, 2 = doubled. |
| `grade_info` (optional) | string |  |  | Upstream grade metadata. Not used for the adjustment; stored as the 'upstream' field of the grade_info output. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |
| `grade_info` | STRING |

## LUT

`RadianceLUTApply`

Apply a 3D LUT (.cube) with trilinear or tetrahedral interpolation. Encodes a scene-linear image into the LUT's input (LogC, S-Log3, ACEScct...) when asked, and keeps HDR (unclamped) output.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Image to transform. Values should be in the encoding the LUT expects; anything outside the LUT's DOMAIN_MIN/MAX (0 to 1 by default) is clamped to its edge before lookup. |
| `lut_file` | choice |  | `No LUTs found` | 3D .cube LUT from ComfyUI's models/luts folder. |
| `strength` | float | 1 | 0 to 1, step 0.01 | Mix between the original image (0) and the full LUT result (1). |
| `log_space` | boolean | off |  | On: the image is scene-linear (in working_space) and is encoded into log_encoding, the input the LUT was built for, before the lookup. Use this for show and camera LUTs such as LogC3 to Rec.709. Off: the pixels go into the LUT unchanged, for an image already in the LUT's input space. |
| `log_encoding` (optional) | choice | `ARRI LogC3` | `ARRI LogC3`, `ARRI LogC4`, `Sony S-Log3`, `Panasonic V-Log`, `RED Log3G10`, `Canon Log 3`, `DaVinci Intermediate`, `ACEScct`, `sRGB`, `Rec.709 (BT.1886)`, and 6 more | The encoding the LUT expects as input (camera log, ACEScct, sRGB, PQ...). Used when log_space is on. |
| `clamp_output` (optional) | boolean | off |  | Clamp to 0-1. Disable for HDR. |
| `interpolation` (optional) | choice | `Trilinear` | `Trilinear`, `Tetrahedral` | LUT interpolation between grid points. Tetrahedral is more accurate on hue and neutral axes but slightly slower. |
| `working_space` (optional) | choice | `Linear Rec.709 (sRGB)` | `Linear Rec.709 (sRGB)`, `ACEScg`, `Linear Rec.2020`, `Linear P3-D65`, `ACES2065-1` | The linear space the image is in, used when log_space is on to reach the LUT's input primaries. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |

## LUT Blend

`RadianceLUTBlend`

Blend two LUTs with various blend modes for creative color grading.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Image to transform through both LUTs. Values outside each LUT's domain are clamped to its edge before lookup. |
| `lut_a` | choice |  | `No LUTs found` | First .cube LUT from models/luts. It is the base look: the non-Linear modes keep its luminance or chroma. |
| `lut_b` | choice |  | `No LUTs found` | Second .cube LUT from models/luts, blended towards by blend_factor. |
| `blend_factor` | float | 0.5 | 0 to 1, step 0.01 | 0.0 = LUT A only, 1.0 = LUT B only |
| `blend_mode` | choice | `Linear` | `Linear`, `Luminosity`, `Saturation`, `Hue` | Linear: mix the two results. Luminosity: A's colour with mixed luminance. Saturation: mixed chroma at A's luminance. Hue: mixed chroma direction with A's chroma amount and luminance. |
| `strength` (optional) | float | 1 | 0 to 1, step 0.01 | Mix between the original image (0) and the blended LUT result (1). |
| `clamp_output` (optional) | boolean | off |  | Clamp to 0-1. Disable for HDR. |
| `log_space` (optional) | boolean | off |  | On: the image is scene-linear (in working_space) and is encoded into log_encoding, the input both LUTs were built for, before the lookups. Off: the pixels go into the LUTs unchanged. |
| `log_encoding` (optional) | choice | `ARRI LogC3` | `ARRI LogC3`, `ARRI LogC4`, `Sony S-Log3`, `Panasonic V-Log`, `RED Log3G10`, `Canon Log 3`, `DaVinci Intermediate`, `ACEScct`, `sRGB`, `Rec.709 (BT.1886)`, and 6 more | The encoding both LUTs expect as input (camera log, ACEScct, sRGB, PQ...). Used when log_space is on. |
| `interpolation` (optional) | choice | `Trilinear` | `Trilinear`, `Tetrahedral` | LUT interpolation used for both lookups. Tetrahedral is more accurate but slightly slower. |
| `working_space` (optional) | choice | `Linear Rec.709 (sRGB)` | `Linear Rec.709 (sRGB)`, `ACEScg`, `Linear Rec.2020`, `Linear P3-D65`, `ACES2065-1` | The linear space the image is in, used when log_space is on to reach the LUTs' input primaries. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |

## OCIO ColorSpace

`RadianceColorSpaceConvert`

Convert pixel values between working, display and camera-log colour spaces via a Rec.709-primaries linear intermediate (OCIO for the non-log spaces when a config is loaded). Camera logs are transfer curves only, no gamut change.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | Image encoded in src_space (or in dst_space when direction is Inverse). |
| `src_space` | choice | `Linear sRGB (D65)` | `Linear sRGB (D65)`, `ACEScg`, `ACEScc`, `ACEScct`, `sRGB (OETF encoded)`, `Rec.709 (OETF encoded)`, `Rec.709 / BT.1886`, `LogC3 (ARRI EI800)`, `LogC4 (ARRI Alexa 35)`, `F-Log2 (Fujifilm)`, and 6 more | Encoding of the input. Camera-log choices decode the log curve only and keep Rec.709 primaries; ACES choices also convert AP1 primaries. |
| `dst_space` | choice | `ACEScg` | `Linear sRGB (D65)`, `ACEScg`, `ACEScc`, `ACEScct`, `sRGB (OETF encoded)`, `Rec.709 (OETF encoded)`, `Rec.709 / BT.1886`, `LogC3 (ARRI EI800)`, `LogC4 (ARRI Alexa 35)`, `F-Log2 (Fujifilm)`, and 6 more | Encoding to convert to. Camera-log choices apply the log curve only, on Rec.709 primaries. |
| `direction` | choice | `Forward` | `Forward`, `Inverse` | Forward converts src_space to dst_space. Inverse swaps them (dst_space to src_space). |
| `strength` | float | 1 | 0 to 1, step 0.01 | Mix between input and converted pixel values (0 = input, 1 = full conversion). The mix is done on the raw values of two different encodings. |
| `grade_info_in` (optional) | string |  |  | Optional grade_info JSON from an upstream node. Only recorded as "upstream" in this node's info output; it does not change the image. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |
| `grade_info` | STRING |

## OCIO Context

`RadianceOCIOContext`

Load an OpenColorIO config into Radiance's shared OCIO manager for this session. Color Space Convert uses it for the working and display spaces; wire ocio_context into it to be sure the config is loaded first.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `config_path` | string | `C:/ACES/config.ocio` |  | Path to a config.ocio file. A relative path is looked for in ComfyUI's input/ then output/ folder. The loaded config replaces the session-wide one until another is loaded. |

**Outputs**

| Output | Type | What it is |
| :--- | :--- | :--- |
| `ocio_context` | RADIANCE_OCIO | The loaded config (path and name). Optional input of Color Space Convert. |

## White Balance

`RadianceWhiteBalance`

Shift white balance of a linear image by colour temperature and tint, a Bradford illuminant adaptation, or per-channel RGB gains. Use it on scene-linear plates; it does not sample a neutral from the image.

**Inputs**

| Input | Type | Default | Range or choices | What it does |
| :--- | :--- | :--- | :--- | :--- |
| `image` | IMAGE |  |  | RGB image to rebalance, scene-linear (Rec.709 primaries). Apply to linear data, not display-encoded sRGB. |
| `mode` | choice | `Temperature / Tint` | `Temperature / Tint`, `Illuminant Adapt`, `Manual RGB Gain` | Temperature / Tint: adapt from D65 to a Kelvin white plus a green/magenta tint. Illuminant Adapt: Bradford from src to dst illuminant. Manual RGB Gain: multiply channels. |
| `preset` | choice | `Manual` | `Manual`, `Daylight (5500K)`, `Tungsten (3200K)`, `Fluorescent (4200K)`, `Flash (6000K)`, `Shade (7500K)` | Replaces temperature with a preset Kelvin value. Only used in Temperature / Tint mode; Manual uses the temperature slider. |
| `temperature` | float | 6500 | 1667 to 25000, step 50 | Target white in Kelvin (Planckian locus), adapted from D65. Lower values warm the image, higher values cool it; 6500 is close to neutral. Temperature / Tint mode only. |
| `tint` | float | 0 | -1 to 1, step 0.005 | Green channel gain of 2^(-tint/2): positive adds magenta, negative adds green, +/-1 = half a stop. Temperature / Tint mode only. |
| `src_illuminant` | choice | `D65` | `D50`, `D55`, `D60`, `D65`, `D75`, `A`, `B`, `C`, `E` | White point the image was balanced for (CIE standard illuminant). Illuminant Adapt mode only. |
| `dst_illuminant` | choice | `D50` | `D50`, `D55`, `D60`, `D65`, `D75`, `A`, `B`, `C`, `E` | White point to adapt to with the Bradford transform. Illuminant Adapt mode only. |
| `gain_r` | float | 1 | 0 to 4, step 0.001 | Linear red multiplier, 1 = unchanged. Manual RGB Gain mode only. |
| `gain_g` | float | 1 | 0 to 4, step 0.001 | Linear green multiplier, 1 = unchanged. Manual RGB Gain mode only. |
| `gain_b` | float | 1 | 0 to 4, step 0.001 | Linear blue multiplier, 1 = unchanged. Manual RGB Gain mode only. |
| `strength` | float | 1 | 0 to 1, step 0.01 | Linear mix between the original (0) and the corrected image (1). |
| `grade_info_in` (optional) | string |  |  | Optional grade_info JSON from an upstream node. Only recorded as "upstream" in this node's info output; it does not change the image. |
| `ocio_context` (optional) | RADIANCE_OCIO |  |  | From OCIO Context. Makes sure that config is loaded (and loaded first) before this node converts. |

**Outputs**

| Output | Type |
| :--- | :--- |
| `image` | IMAGE |
| `grade_info` | STRING |