Achieving 80% of Your Final Image Quality: Exposure and Contrast Grading in DaVinci Resolve's First Node

Cullen Kelly

Initial Setup and Importance of the First Node [00:00:00]

Exposure and contrast are identified as the most important pieces of a color grade, comprising 80% of the final image quality after color management and the creative look are established. These fundamental adjustments should be performed in a single node, which should be the very first in the node graph.

• Node Graph Template Structure [00:00:22]
  • The speaker uses a template node graph where the first node is labeled "prime" for primary adjustments.
• Timeline Level Adjustments [00:00:37]
  • Color Management (Output Transform) [00:00:42]
    • Utilizes a free third-party tool called Open DRT (Display Rendering Transform) to map the graded image for accurate display on a reference monitor.
    • This ensures the image looks correct on the specific display environment.

      

  • Creative Look Development [00:01:05]
    • Employs a look development plugin, Contour, at the timeline level to provide a baseline creative look across all shots.
    • This establishes the creative contrast curve, color separation, and saturation, forming a strong creative foundation before per-shot adjustments.

      

Exposure Adjustment [00:01:58]

The grading process begins with exposure, which is considered a creative rather than a technical parameter at this stage.

• Creative vs. Technical Exposure [00:02:20]
  • Exposure at the grading stage is subjective; it's "good" when the colorist and client like it.
  • Technical exposure practices are for shooting, but in post-production, it's about aesthetic preference.
• Tool for Exposure: HDR Global [00:02:07]
  • The speaker uses the global exposure slider within the HDR palette for adjustments.
  • Photometric Adjustment [00:03:08]
    • HDR Global provides a "photometric" adjustment, meaning it behaves like opening/closing a lens or adjusting light on set, changing only exposure without affecting contrast.

      

• Why Avoid Offset for Exposure [00:03:55]
  • Demonstrates that the "Offset" tool (a common primary adjustment) changes both exposure and contrast simultaneously.
  • This dual adjustment makes it harder to work efficiently and can lead to "chasing your own tail" as one adjustment necessitates compensating for the other.

    

Contrast Adjustment [00:05:30]

Similar to exposure, contrast adjustments should ideally be isolated to avoid affecting other parameters.

• Avoiding Lift, Gamma, Gain for Contrast [00:05:55]
  • Lift, Gamma, and Gain controls will almost always affect exposure when adjusting contrast, making them less ideal for precise, isolated adjustments.
• Tool for Contrast: Primaries Contrast with Custom Pivot [00:06:19]
  • The primaries contrast slider is used in conjunction with a custom "pivot" point.
  • Understanding the Pivot Point [00:07:03]
    • Contrast involves stretching tones; the pivot point determines around which value this stretch occurs.
    • "Magic Number" 336 [00:07:24]
      • For DaVinci YRGB Intermediate color space, 336 represents middle gray.
      • Setting the pivot to 336 ensures that increasing or decreasing contrast is centered around middle gray, preventing unintended shifts in overall exposure.

        

      • This specific pivot value for various color spaces can be found in a "Mid-Gray Cheat Sheet" resource. [00:11:22]
• Principles for Contrast Adjustments [00:08:10]
  • Maintain, Don't Create/Remove Drastically [00:08:50]
    • At the shot level, the goal is often to maintain the contrast ratio defined in the overall creative look, not to create a new one.
  • Review Overall Look if Repeated Adjustments are Needed [00:09:47]
    • If many shots consistently require increasing or decreasing contrast, it suggests that the project's overall look (set at the timeline level) might need adjustment.

Workflow Efficiency and Node Structure [00:12:45]

The video addresses common questions about combining exposure and contrast in a single node and the concept of "80% done."

• Combining Exposure and Contrast in One Node [00:12:58]
  • The speaker prefers doing both in one node because they are highly interactive, and the net visual effect of both combined is what ultimately matters.
  • This allows for easy toggling of the entire primary adjustment to see its impact.
• The "80% Done" Concept [00:15:26]
  • This isn't a goal to strive for, but a recognition that by the time color management, look, exposure, and contrast are dialed in, the "DNA" of the image is largely set.
  • Further adjustments will have a diminished influence on the fundamental quality of the grade.
  • This emphasizes the critical importance of getting these initial steps right, especially for challenging footage.

Finessing Contrast with Custom Curves [00:17:07]

A bonus technique for subtle contrast shaping in the shadows and highlights.

• Goal: Softness in Extremes, Strength in Mids [00:17:30]
  • The aim is to have strong contrast through the middle tones, but softer, shaped contrast in the very low (shadows) and very high (highlights) ends to preserve detail and avoid harshness.
• Method using Custom Curves [00:17:52]
  • Step 1: Identify Middle Gray [00:18:01]
    • Use an "Exposure Chart DCTL" (a free tool) set to a single step of middle gray to precisely identify the middle gray point in the waveform.

      

  • Step 2: Anchor Custom Curve [00:18:29]
    • In a custom curve, "eyelid" the middle gray patch to create an anchor point. This ensures that any curve adjustments below or above this point will not shift overall exposure.

      

  • Step 3: Shape Shadows/Highlights [00:19:08]
    • Gently lift the bottom of the curve to add softness to shadows (or pull down the top for highlights) to finesse contrast in those regions without affecting the critical middle tones.

      

• Integrating into Node 1 [00:19:41]
  • This mid-gray anchored custom curve can be saved as part of the initial node template, allowing for quick and efficient application of this finesse whenever needed without repetitive setup.
• Bulletproof Contrast Recipe [00:20:40]
  • Strong contrast through the middle, with softer, shaped contrast in the shadows and highlights to retain detail and prevent clipping.