Achieving Professional Color Grades with a Simplified 4-Node ACES Lite Workflow in DaVinci Resolve

Summary:

This video demonstrates an efficient and professional color grading workflow in DaVinci Resolve using only four primary nodes within an ACES Lite color management system. Key takeaways include:

Simplicity and Speed: A streamlined workflow leads to better and faster results compared to overly complex node trees, highlighted by the "Only 4 Nodes" visual [0:21].
Four Core Nodes: The essential nodes are IDT (Input Device Transform), CC (Color Correction), LMT (Look Modification Transform), and ODT (Output Device Transform), clearly illustrated by a node diagram [1:14].
Node Placement: IDT and CC are applied at the clip level for individual adjustments, while LMT and ODT are at the group post-clip level for global changes, as shown in the DaVinci Resolve interface [1:45].
Photographically Accurate Correction: The CC node utilizes color space-aware tools like the HDR Global Wheel for precise exposure and white balance, mimicking real camera adjustments, with an example shown in the interface [4:19].
Consistent Looks with LMTs: The LMT node allows applying a specific aesthetic (e.g., film emulation) consistently across all clips [5:46], with before-and-after split-screen examples [7:46].
Compound Nodes for Complexity & Flexibility: The LMT is often a compound node, allowing intricate effects (grain, halation, diffusion, film artifacts) to be managed as a single unit [10:00]. Users can customize elements within these compound nodes [10:00], and even apply complex analog film artifacts [12:31] shown with a visual example [13:16].
Advanced Adjustments: The workflow allows for adding additional nodes for specific, complex adjustments like local tone mapping using HSL secondaries [6:57].

Introduction: The Power of Simplicity in Color Grading [0:00]

Many colorists mistakenly believe that a complex node tree signifies professionalism [0:00].
However, understanding the underlying process reveals that simplicity often leads to better and faster results [0:07].
This video aims to demonstrate how to achieve professional color grading using a streamlined four-node workflow in DaVinci Resolve [0:10]. [0:21]
It's important to note that while emphasizing four nodes, more complex arrangements (like compound nodes) are sometimes used for specific effects [0:37].

Understanding the 4-Node ACES Lite Color Workflow [1:06]

The demonstrated workflow is a node-based ACES (Academy Color Encoding System) Lite color-managed workflow [1:06].
The Four Nodes Explained [1:14] [1:14]
- Node 1: IDT (Input Device Transform) [1:14]
- Node 2: CC (Color Correction) [1:18]
- Node 3: LMT (Look Modification Transform) [1:20]
- Node 4: ODT (Output Device Transform) [1:22]
Node Functions and Placement [1:27]
- Color management is handled by the IDT and ODT nodes [1:27].
- Color modification is handled by the CC and LMT nodes [1:31].
- The first two nodes (IDT and CC) are applied to individual clips [1:34].
- The last two nodes (LMT and ODT) are applied to all clips simultaneously via a group post-clip tab [1:38].

Applying the 4-Node Workflow in DaVinci Resolve [1:45]

Setting Up the Group [1:48] [1:45]
- Clips are linked together to form a group [1:48].
- Individual clip modifications are made in the clip tab, while global modifications for the entire group are made in the group post-clip tab [2:00].
Node 1: Input Device Transform (IDT) [2:14]
- Purpose and Setup [2:19]
  - This node transforms footage from its original camera capture profile into the ACES color space [2:19].
  - It is placed at the clip level because different cameras (e.g., Arri Alexa, iPhone) may be used, requiring separate input transforms for each clip [2:26].
  - The "Color Space Transform" effect is used, setting the input color space and gamma to the camera's profile (e.g., Arri Wide Gamut 3, Arri Log C) and the output to ACES AP1 and ACEScct [2:45].
Node 4: Output Device Transform (ODT) [2:58]
- Purpose and Setup [3:09]
  - This node transforms the footage from the ACES color space to the desired delivery color space (e.g., Rec.709 A for standard dynamic range) [3:09].
  - It is placed at the group post-clip level, affecting all clips in the timeline consistently [3:00].
  - A significant advantage is the ability to easily deliver in HDR without re-grading the entire project, simply by changing the ODT settings [3:21].
Node 2: Color Correction (CC) [3:30]
- Photographically Accurate Adjustments [3:50]
  - This node is used for initial color correction, focusing on achieving photographically accurate exposure and white balance [3:50].
  - It's placed at the clip level to address variations between individual clips (e.g., different white balance or exposure settings from various takes) [3:36].
  - To perform accurate color correction, color space-aware tools are essential, such as the HDR Global Wheel in DaVinci Resolve [4:19]. [4:19]
  - It's crucial that the timeline color space is set to ACEScct in the project settings, aligning with the first node's output, to ensure these tools function like correcting raw footage [4:24].
  - The presenter demonstrates adjusting exposure and white balance using the HDR Global Wheel, highlighting how contrast remains consistent [4:51].
  - Additional contrast adjustments (which are non-photographically accurate) can also be made in this node if desired [5:11].
Node 3: Look Modification Transform (LMT) [5:25]
- Applying Aesthetic Looks [7:25]
  - This node is responsible for applying the overall aesthetic "look" to the footage [7:25].
  - It is placed at the group post-clip level so that the chosen look is consistently applied to all clips in the project [5:30]. [5:46]
  - The video demonstrates applying a film emulation look (Vision3 500T film stock), showcasing its effect on the footage [5:46].
  - A key benefit is that this look works consistently across clips from different cameras (e.g., Arri Alexa, iPhone) as long as the initial IDT and CC steps were done correctly [7:46]. [7:46] [7:46]
- LMT Customization and Flexibility [10:32]
  - The LMT node is presented as a compound node, meaning it contains a group of multiple nodes and effects hidden within it [10:00]. [10:00]
  - Despite being a compound node, it is considered as one functional unit for workflow simplicity [10:11].
  - Users can open and customize the individual effects within the LMT, such as:
    - Adjusting the strength of the halation effect [10:32].
    - Modifying or disabling the diffusion effect [10:40].
    - Changing the grain size (e.g., from 35mm to 16mm) or removing it entirely [10:47].
    - Warming up or cooling down the overall look [10:58].
    - Adjusting the overall strength of the entire LMT using the key output gain [11:13].

Advanced Applications and Workflow Philosophy [6:00]

Adding More Nodes for Specific Needs [6:00]
- While the core workflow uses four nodes, additional nodes can be inserted for specific, complex adjustments.
- Re-lighting a Scene [6:09]
  - An example is shown where a fifth node is used to re-light the subject's face [6:09].
  - This involves creating a power grade, tracking it, using HSL secondaries to isolate the light areas of the face, applying denoise, and then adjusting exposure with the HDR Global Wheel [6:19].
- Local Tone Mapping [6:47]
  - Another advanced technique demonstrated is local tone mapping, used to sculpt exposure levels within the footage [6:47].
  - For instance, to bring down hot neon lights in the background, an HSL secondary is used to mask and target these bright areas, and then the gain wheel is used to reduce their intensity [6:57]. [6:57]
Workflow Philosophy: Analogue vs. Digital [9:00]
- The video contrasts this structured workflow with the "endless tweaking" often seen in digital color grading [9:00].
- The ACES Lite workflow is compared to analog film production, where the chosen film stock largely dictates the final look [9:13].
- By using LMTs as pre-designed "looks" or compound nodes, colorists can avoid reinventing the wheel for every project [11:30].
- This approach encourages creating a strong foundational look and then making minor, targeted adjustments, much like how film labs would process film stock [11:46].
Adding Analog Artifacts with LMTs [12:31]
- The "Analog Artifacts" LMT demonstrates a compound node containing multiple effects to emulate the characteristics of vintage film: [12:31]
  - Film breath: Mimics cinematic exposure flicker [12:50].
  - Vignette: Adds darker edges to the frame [12:52].
  - Scan dust: Creates the appearance of dust particles from film scanning [12:54].
  - Chromatic aberration: Replicates the lens imperfections of vintage lenses [12:58].
  - Lens reflections: Simulates light bouncing within the lens [13:03].
  - Edge blur: Adds realistic out-of-focus effect to frame edges [13:09].
  - Film frame: Incorporates a textured film negative frame [13:16]. [13:16]
  - Film strip: Makes the footage appear like a film strip [13:22].
  - Film perfs: Adds film perforations to the sides [13:27].
  - Gate weave: Creates a subtle frame shake like real film [13:34].
- These combined effects create a highly realistic analog film aesthetic, all controlled within a single compound LMT node.