Master Green Screen Compositing in Davinci Resolve

Table of Contents

1. Introduction
2. What is chroma keying?
3. Importing the green screen footage
4. adding a background
5. Using the 3D keyer
6. Adjusting color values for keying
7. Fixing green residue and refining the matte
8. Resizing the foreground and grading
9. Creating a new Fusion comp
10. Motion tracking the background
11. Adding depth blur and glow
12. Final grading
13. Adding LUTs and grains
14. Conclusion
15. Additional Resources

Introduction

In this episode of Film Grasp, we will be exploring the technique of chroma keying in DaVinci Resolve. Chroma keying is a visual effects technique used to replace the background of a video Based on color hues, typically with a green screen. By mastering this technique, You'll be able to Create stunning composite shots and seamlessly integrate subjects into any desired environment.

What is chroma keying?

Chroma keying, also known as green screen or Blue screen, is a method used in visual effects and post-production to replace a specific color in a video with a different image or footage. This technique is widely used in the film and television industry to create impressive special effects and composite shots. By using a solid-colored backdrop (typically green or blue), the editor can easily isolate the subject and replace the background with any desired image or footage.

Importing the green screen footage

To begin the chroma keying process, you need to import the green screen footage into your editing software. In DaVinci Resolve, simply import the footage into your timeline, ensuring that it is placed on a separate layer.

Adding a background

Next, you'll want to add a background for your composite shot. Place the background footage below your green screen footage on the timeline. This arrangement will allow the background layer to be revealed once the keying process is applied.

Using the 3D keyer

In order to key out the green screen, we will utilize the 3D keyer in DaVinci Resolve. Go to the Effects menu and search for "3D keyer." Drag and drop the 3D keyer effect onto your green screen footage.

Adjusting color values for keying

Under the Inspector tab in the Effects menu, you'll find the 3D keyer settings. Use the color pickers to select the specific color values you want to replace, in this case, green. Click on the green areas in your footage, but don't worry if the keying doesn't happen immediately.

Fixing green residue and refining the matte

To remove any green residue, go to the bottom left corner of the viewer and click on the "Open FX Overlay" button. This step is crucial to Visualize the changes. Now, Continue picking the color until the keying looks satisfactory. You may have to tweak and refine the settings to achieve the desired result. To ensure that only the subjects remain white and the rest of the background becomes black, adjust the range settings accordingly.

Resizing the foreground and grading

At this point, you may need to resize the foreground subject and perform some grading to match the background. Navigate to the Color page and create a new serial node for grading. Use color wheels to adjust lift, gain, and gamma to achieve the desired look. Compare the changes and make adjustments as needed.

Creating a new fusion comp

To further enhance the composite shot, we'll create a new fusion comp. Select both the background and foreground footage and create a new fusion clip. This will open the fusion page, where you can arrange the nodes for better visibility.

Motion tracking the background

To ensure that the composited elements stay in place, we need to motion track the background. Zoom in on the background layer and select the "Planner Tracker" tool from the Select Tool menu. Set the tracker to area and motion Type to translation and rotation. Mark an area with distinct tracking points and track the shot from the Current frame to the last frame. Then, go back to frame 44 (or any reference frame) and track the rest of the shot backward.

Adding depth blur and glow

For a more realistic composite, you can consider adding depth blur to the background. Open the Depth Blur tool and adjust the focal point and blur size to create depth of field. Additionally, you can add a glow effect to enhance the rim light on the subject. Experiment with the threshold and spread settings to achieve the desired aesthetic.

Final grading

Before finalizing the composite shot, perform any necessary adjustments and grading. Rename the main node and add a new node for LUT (Lookup Table) application. Load a suitable LUT from the available options and adjust the output to achieve the desired look. This step will add cinematic tones to your composite shot.

Adding LUTs and grains

To further enhance the visual quality of the composite shot, you can add film grains. Create a new serial node and add a Parallel node to introduce grains. Import suitable grains from a film overlay pack and add them to the media pool. Connect the grains to the parallel node using a matte timeline matte. Adjust the grain output and intensity to achieve the desired effect.

Conclusion

Chroma keying is a powerful technique that can elevate your post-production game. With the right tools and knowledge, you can seamlessly replace backgrounds and create stunning composite shots. By following the steps outlined in this tutorial, you'll be able to master chroma keying and take your filmmaking skills to the next level.

Additional Resources

• FilmBlade.com: Explore high-end 16 millimeter pro 4k film grain pack and other premium assets to enhance your post-production workflow.
• Film Grasp on YouTube: Subscribe to the FilmGrasp Channel for more tutorials and insights into advanced post-production techniques.
• Follow us on Instagram: Stay updated with the latest news and updates from FilmBlade by following us on Instagram @filmblade.

FAQ

Q: What is the purpose of chroma keying? A: Chroma keying is used to replace the background of a video with a different image or footage. It is widely used in the film and television industry for creating special effects and composite shots.

Q: What software is best for chroma keying? A: DaVinci Resolve is a powerful editing software that offers advanced chroma keying capabilities. It provides tools and features specifically designed for precise keying and compositing.

Q: Do I need a green screen for chroma keying? A: While a green screen or blue screen is commonly used for chroma keying, it is not the only option. The keying process can be applied to any color, as long as it is consistent and distinguishable from the subject.

Q: Can I use chroma keying for live video streaming? A: Yes, chroma keying can be used for live video streaming. Many streaming software and platforms offer built-in chroma keying features, allowing you to replace the background in real-time.

Q: What are some common challenges in chroma keying? A: Chroma keying can be challenging due to factors such as inconsistent lighting, color spill, and low-quality footage. It requires careful adjustments and fine-tuning to achieve a seamless and realistic composite shot.