FXTD®Radiance for ComfyUI
RADIANCE / DOCUMENTATION3.5.0 · Release candidate

Node reference / Radiance for ComfyUI

Color nodes

White balance, CDL, curves, LUTs, OCIO, grades, and color checks.

18 nodes. All sections

Apply Grade Info

RadianceApplyGradeInfo

Apply Grade Info node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

ARRI Wide Gamut 4 node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

Bake Viewer Grade node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

CDL node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

CDL Export node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

CDL Import node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

ColorCorrect node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

ColorLookup node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

DaVinci Wide Gamut node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

Grade node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

Grade Match node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

HDR Color Convert node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

HueCorrect node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

LUT node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

LUT Blend node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

OCIO ColorSpace node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

OCIO Context node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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

White Balance node in Radiance 3.5.0, default interface
Captured from Radiance 3.5.0 · Default interface · Select to open the full-resolution screenshot. Controls can change with presets and connections.

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