3D LUT & Color Management
OmniScope supports applying colour transforms to input sources using 3D LUTs, 1D LUTs, ICC profiles, and OpenColorIO (OCIO) configurations. This lets you preview graded images, match monitor profiles, or convert between colour spaces — all without affecting the original signal.
A 3D LUT is a lookup table, not a formula. It samples the RGB cube on a regular grid (commonly 17³, 33³, or 65³ points) and stores the transformed output at each vertex. At runtime, the input colour is located inside the cube and interpolated from its eight surrounding vertices using either trilinear (fast, cheaper, slightly less accurate) or tetrahedral (higher quality, especially for saturated colours) interpolation. A 1D LUT only transforms one channel at a time and cannot do chromaticity changes — it is used for tone shaping (gamma / EOTF conversion) but cannot implement a full camera-to-display colour transform. Use 1D LUTs for transfer-function changes, 3D LUTs for gamut-and-transfer changes together.
Input 3D LUT
Each input source can have its own 3D LUT applied before the signal reaches the scopes. This is useful for monitoring how the image will look after a grade, or for converting log/RAW signals to a display colour space.
Applying a LUT
Open the 3D LUT browser — Options > 3D LUT or use the keyboard shortcut ⌥D (macOS) / Alt+D (Windows) to toggle LUTs on all inputs
Select a LUT file from the browser
Enable Input LUT in the input settings
The LUT is applied per input slot, so each connected source can use a different transform.
Supported Formats
3D LUT
.cube, .3dl, .csp, .lut
1D LUT
.cube, .spi1d (1.10.139+)
LUT Options
Tetrahedral interpolation
Higher-quality LUT interpolation (more accurate but slightly slower)
Apply to output
Include the input LUT in NDI/SDI output signal
Apply to snapshot
Apply the LUT when comparing snapshots in split mode
ICC Profiles
ICC profiles can be loaded to compensate for monitor colour characteristics. OmniScope can also read the system's display ICC profile on macOS.
Display ICC profile
Use the monitor's ICC profile for accurate colour display (macOS)
Custom ICC profile
Load a specific ICC profile file
OpenColorIO (OCIO)
OCIO support requires a Pro license.
OmniScope integrates with OpenColorIO 2.5.1 for professional colour pipeline management. Load a custom OCIO configuration to access all colour spaces defined in your pipeline.
Set the OCIO config path in Preferences / OpenColorIO
Select input and display colour spaces from the OCIO configuration
Colour space primaries from the active OCIO config are shown in the CIE Plot
Bundled ACES Config
OmniScope ships with a bundled ACES configuration that does not require any external OCIO setup. In Preferences / OpenColorIO, select the ACES version that matches your project:
ACES 1.3
Standard ACES 1.3 transforms
ACES 2.0 (compat)
ACES 2.0 with compatibility transforms
Use the bundled config for ACES monitoring in DaVinci Resolve or other hosts — see ACES Monitoring (DaVinci Resolve OFX) for the full setup guide.
ACES in a nutshell
The Academy Color Encoding System is a scene-referred, camera-agnostic colour pipeline standardised by the Academy of Motion Picture Arts and Sciences. Every ACES transform slots into one of four stages:
IDT — Input Device Transform
Converts a specific camera's native colour space (ARRI Log C, Sony S-Log3/S-Gamut3, RED IPP2, etc.) to scene-linear ACES2065-1 (AP0 primaries)
Per-source / per-clip
LMT — Look Modification Transform
Optional creative "look" applied in ACES space, before the output transform. Examples: film emulation, print-emulation LUT, directorial look
Per-sequence / global
RRT — Reference Rendering Transform
Fixed, canonical tone and gamut rendering from scene-linear to an intermediate display-referred space (OCES)
Global (part of the Output Transform)
ODT — Output Device Transform
Maps the RRT output to a specific display — Rec. 709 sRGB, Rec. 2020 PQ 1 000 nits, P3-D65 2 000 nits, DCI-P3, etc.
Per-output
Working in ACES has two big advantages for scope analysis: (1) every camera looks like every other camera in the working space, so exposure and white-balance calls are apples-to-apples, and (2) the IDT — not the LUT chain — handles the camera conversion, so decisions about "what should this neutral grey be at" are stable across clips. The trade-off is that you must apply the matching ODT before looking at the picture on a display-referred monitor. OmniScope's OCIO support puts the ODT selection in your hands.
3D LUT / ICC Scope
The dedicated 3D LUT / ICC scope shows the effect of the colour transform in a separate viewer, letting you compare the original and transformed image.
Keyboard Shortcuts
⌥D
Alt+D
Toggle input 3D LUT on all sources
Related
False Color — can export a 3D LUT
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