Advanced Exposure Setting and Color Grading in DaVinci Resolve Using QT Charts

Chef Odd

The Challenge of Traditional Exposure Setting [00:00:28]

The video begins by addressing a fundamental question in color grading: "How do I set my exposure correctly?" The presenter highlights the common difficulties faced by colorists using traditional methods in DaVinci Resolve.

• The complexities of balancing various elements
  • Exposure settings involve managing primaries, lift, gamma, gain, HDR wheels, custom curves, and contrast ratio.
  • Introducing looks and saturation further complicates the balancing act, often requiring rebalancing and leading to a laborious process.
• Limitations of manual adjustments (Option 1) [00:01:26]
  • The presenter demonstrates manually adjusting gain, gamma, and lift to protect highlights, noting how these adjustments affect other parts of the image, like skin tones and darker areas.
  • Manually adding contrast using the custom curve is shown to be time-consuming and can lead to "crunchy" or unnatural-looking results, especially in skin tones.
  • This method is deemed unsustainable and not protective of the initial exposure settings, making the workflow inefficient.

The Inefficiency of HDR Wheels and Custom Curves [00:04:40]

The presenter moves on to demonstrate the HDR wheels and custom curves, showing that while they offer more control, they still don't fully address the core issue of maintaining exposure integrity across various adjustments.

• Using HDR wheels for highlights and shadows [00:04:40]
  • Adjusting the light to bring down highlights and boosting mid-tones helps, but still requires a balancing act when adding contrast.
  • The process remains time-consuming and can lead to colorists feeling exhausted when working on multiple shots.
• Failure to protect middle gray [00:05:14]
  • A critical concern is the inability to protect the middle gray point, which a Director of Photography (DP) might have specifically set for exposure.
  • Without proper tools, identifying and maintaining the middle gray point is difficult, especially when color management is set to DaVinci Wide Gamut.

Introducing QT Charts: The Professional Solution [00:05:55]

The video transitions to introducing "QT charts" as the advanced, efficient, and protective solution for professional colorists.

• Achieving "head-turning grades" quickly [00:05:59]
  • QT charts enable colorists to achieve incredible, protected grades in minutes, creating high-key looks without worrying about losing detail.
  • The tools within QT charts are designed to protect the image, ensuring initial balancing holds even when introducing other grading elements.
• Key features of QT charts
  • False Color for Exposure [00:06:58]
    • Enabling false color shows that nothing exceeds five stops, indicating a safe exposure range. Six stops would be the danger zone.
    • It provides clear visualization of middle gray areas, helping to protect them across the image (e.g., buildings, jeans, car).

      

  • Saturation False Color [00:07:32]
    • This unique feature shows where saturation lies, allowing colorists to push or pull saturation without going too far or leaving room for more.
  • Negatives Indicator [00:08:26]
    • This indicator instantly alerts if any part of the image falls below the zero value (danger zone), ensuring shadows retain detail.
  • Highlight Neutrals [00:08:52]
    • Brown representing 5% indicates ample room to push the image further without breaking it, thanks to embedded parameters that protect the image.
  • Middle Gray Protection [00:09:33]
    • A visual indicator demonstrates how middle gray remains intact and locked, even when applying contrast or exposure adjustments with the curves.

      

  • Gentle Curve Adjustments [00:10:55]
    • Sliders for highlights, mid-tones, and undertones allow for gentle, precise adjustments without creating a thousand points on the curve, ensuring consistent protection of the image's elements (e.g., product, car, sky, building).

      

  • Gradient Chart for Tint Removal [00:11:43]
    • This tool is crucial for removing unwanted tints (e.g., magenta cast in car silver) from highlights, ensuring clean black and white points and adding depth.
    • A slider allows for balancing and cleaning up highlight points by blending, making it feel like in-camera adjustments.

      

  • Curves Blend [00:13:53]
    • This feature allows for blending contrast choices, primarily for exposure, ensuring a harmonious look before any color work is even done.

Practical Application and Benefits [00:15:08]

The video demonstrates the application of QT charts on different shots, highlighting their effectiveness in real-time.

• Speed and efficiency
  • The tools allow for quick adjustments of mid-tone contrast, highlights, and black points while protecting saturation and dynamic tonality.
  • The entire process is significantly faster than traditional methods, maintaining image integrity throughout.
• Consistency across shots
  • Applying a "power grade" (preset) with QT charts quickly sets a strong, protected base for new shots, demonstrating immediate visual improvement and proper exposure.

    

    

  • Even if an initial exposure adjustment is forgotten, the underlying protection of the QT charts ensures a good starting point for further refinement.
• Overall confidence in grading
  • QT charts provide a professional way to determine correct exposure, maintain it throughout the workflow, and ensure the final output is safe for distribution across various screens.