In the world of modern filmmaking, the terms CGI and VFX are often used interchangeably—but they’re not the same thing. Understanding the difference between them can help you choose the right approach for your creative project, whether you’re making a short film, a children’s book trailer, or a high-end commercial.
Let’s break down what each term means, how they work, and when it’s best to use one over the other.
What is VFX (Visual Effects)?
Visual Effects (VFX) refers to any process that involves altering or enhancing live-action footage after it’s been captured. This can include everything from removing wires or set elements to adding huge explosions, magical spells, or digital environments.
Think of VFX as the umbrella under which many digital techniques live—including CGI.
Examples of VFX:
- Replacing green screens with digital backgrounds
- Adding smoke, fire, or weather effects in post-production
- Creating entire crowd scenes using duplication
- De-aging an actor’s face digitally
So, VFX includes many methods—some practical, some digital—that come together to shape the final look of a scene.
What is CGI (Computer-Generated Imagery)?
CGI, or Computer-Generated Imagery, is a subset of VFX. It specifically refers to images and animations that are created entirely by a computer, usually using 3D software.
While VFX enhances or manipulates existing footage, CGI creates visuals from scratch—whether it’s a dragon, a spaceship, or an entire city skyline.
Examples of CGI:
- A digitally created dinosaur in a jungle
- 3D animated characters or creatures
- Entire scenes or environments built in 3D software
- Vehicles, architecture, or props that don’t exist in real life
How They Work Together
In most modern productions, CGI and VFX work side-by-side. For example, if a superhero is flying through a city:
- The city skyline might be CGI
- The glowing energy trail could be VFX
- And the actor might be filmed on a green screen that is later removed with VFX techniques
VFX is the process; CGI is often the content created for that process.
When Should You Use VFX?
Use VFX when:
- You’re working with live-action footage that needs enhancement
- You want to fix or remove elements in post-production
- You’re adding realistic effects like smoke, sparks, or lighting
- You need to blend real-world and digital elements seamlessly
VFX is ideal for film, TV, YouTube videos, trailers, and even branded content.
When Should You Use CGI?
Use CGI when:
- You need to create something that doesn’t exist in real life
- You’re designing animated characters, creatures, or vehicles
- You want full control over the environment or action
- You’re working on animation-heavy projects or virtual product demos
CGI is also perfect for children’s media, fantasy storytelling, game trailers, and explainer videos.
Final Thoughts
While CGI and VFX are closely connected, they serve different purposes. VFX is about altering or improving existing footage, while CGI is about creating new visual elements using digital tools.
Understanding when and how to use each one can elevate your storytelling, save time in production, and help you achieve exactly the look you’re going for—whether that’s realistic, whimsical, or totally out of this world.
Add a Comment