VFX vs CGI: What’s the Difference and When Do You Need Each?

Imagine watching a film in which a city disappears into the ocean, a futuristic vehicle races through a real street, or an ordinary landscape transforms into an extraordinary fantasy world. How are these visuals created? Is it VFX, CGI, or a combination of both?

The terms VFX vs CGI are often used interchangeably, but they do not mean the same thing. Understanding the difference helps filmmakers, production companies, advertising agencies, and brands make better decisions about their visual content.

The simplest explanation is this: CGI (Computer-Generated Imagery) refers to visuals created using computers, while VFX (Visual Effects) refers to the broader process of creating, modifying, or integrating visual elements into a shot. CGI can be an important part of VFX, but visual effects can also involve techniques that do not require creating a complete computer-generated scene.

So, what is the difference between VFX and CGI, and when should you use each? Let’s break it down with practical examples.

What Is VFX (Visual Effects)?

Visual Effects (VFX) is the process of creating, altering, or combining visual elements to produce a final image that may be difficult, expensive, unsafe, or impossible to capture entirely in-camera.

VFX is widely used in feature films, television series, streaming content, commercials, and other forms of video production.

For example, a filmmaker might shoot an actor on a physical set and later add a digital city skyline, remove visible equipment, replace the sky, or integrate a computer-generated creature into the scene.

The goal is not necessarily to make every element digitally. It is to create the intended final shot while preserving visual consistency and supporting the story.

Common VFX techniques

• Compositing: Combining live-action footage, CGI, and other visual elements into a cohesive image.
• Green screen compositing: Replacing a green or blue background with another environment or visual element.
• Set extensions: Digitally expanding a physical set to create a larger or more elaborate location.
• Rotoscoping: Isolating foreground subjects from their backgrounds using animated mattes or masks.
• Clean-up and object removal: Removing unwanted objects, wires, rigs, or other elements from footage.
• Crowd multiplication: Expanding a small group of performers into a larger crowd.
• Digital environment creation: Building or enhancing landscapes, buildings, and other environments for a shot.

Not every VFX shot requires CGI. For example, removing a visible wire from live-action footage is a visual effects task even when no new 3D object is created.

Explore Digikore Studios’ VFX services to learn more about the techniques used to create and enhance cinematic shots.

What Is CGI (Computer-Generated Imagery)?

Computer-Generated Imagery (CGI) refers to visual content created using computer graphics. It can include still images, 3D models, animated characters, digital environments, vehicles, buildings, and simulated effects.

CGI allows artists to create visuals that can be difficult or impractical to produce physically. Depending on the project, these elements may appear on their own or be integrated into live-action footage.

For instance, a production might use CGI to create a futuristic aircraft, a digital creature, a detailed architectural environment, or a product visual that would be difficult to photograph in real life.

Common CGI applications

• 3D modelling: Creating digital objects, characters, vehicles, and environments.
• 3D animation: Giving digital characters and objects movement.
• Texturing and shading: Defining the surface appearance and material properties of digital assets.
• Lighting and rendering: Simulating illumination and generating the final image from a digital scene.
• Simulation: Creating digital representations of phenomena such as fluids, smoke, fire, and destruction.
• Digital environment creation: Building computer-generated locations and worlds.

CGI is not limited to live-action films. A fully computer-animated feature can be made primarily or entirely with CGI, without relying on live-action footage as its visual foundation.

For example, in a fully CG-animated film, characters, environments, lighting, and movement are created digitally. In a live-action film, CGI might instead be used to create a vehicle or creature that is later integrated into filmed footage.

The distinction is that CGI describes how visual content is created, not necessarily how it is used in the final production.

VFX vs CGI: What’s the Difference?

The key difference between VFX and CGI is the scope of each term. CGI refers to computer-generated visual content, whereas VFX describes a broader visual production process that may involve live-action footage, digital elements, compositing, clean-up, and other techniques.

Here is a quick comparison.

The simplest way to remember it: CGI creates digital visual elements; VFX brings visual elements together or modifies them to achieve the final shot. The two often overlap, but neither term is a perfect substitute for the other.

CGI vs VFX: Real-World Examples

Understanding definitions is useful, but examples make the difference between CGI vs VFX easier to recognise.

Example 1: A dragon flying over a real city

Imagine a fantasy film in which an actor stands on a rooftop while a dragon flies between buildings.

The dragon may be created using CGI, including modelling, texturing, rigging, animation, lighting, and rendering. The VFX process then integrates the dragon into the live-action shot.

Artists may need to match the camera movement, lighting, shadows, reflections, atmospheric perspective, and colour of the original footage.

In this case, CGI creates the dragon, while VFX helps make the dragon appear as though it belongs in the filmed environment.

Example 2: Removing a wire from an action sequence

Suppose an actor performs a stunt while supported by a safety wire. The wire is visible in the original footage, but it should not appear in the final film.

A VFX artist can remove it through digital clean-up, reconstructing the affected background where necessary.

This is VFX without necessarily requiring CGI. The task involves modifying existing footage rather than creating a new 3D asset.

Example 3: Creating a futuristic product advertisement

A brand wants to advertise a new electric vehicle against a dramatic digital backdrop, with close-up shots of the vehicle’s design and animated components.

The team might use CGI to create the vehicle, materials, lighting, and environment. If the final advertisement also includes live-action footage, digital compositing and other VFX techniques may be needed to combine the elements seamlessly.

For a product visual created entirely in a 3D environment, CGI may be the primary production method without a conventional live-action VFX workflow.

Example 4: Expanding a film set

A production shoots a conversation on a small physical set but needs the final scene to look like a vast palace interior.

The VFX team may extend the architecture digitally, adding distant columns, corridors, ceilings, and other environmental details.

If these additions are generated in 3D, CGI contributes to the set extension. The broader VFX process integrates the digital environment with the photographed set.

These examples demonstrate why choosing between CGI and VFX is not always an either-or decision. Many productions use both, with the requirements of each shot determining the workflow.

When Should You Choose VFX?

VFX services are particularly useful when a project involves existing footage that needs to be enhanced, modified, expanded, or combined with other visual elements.

Consider VFX when:

• You need to remove unwanted objects, wires, or equipment from footage.
• You want to replace a background or expand a physical location.
• Your film requires digital characters or environments integrated into live-action scenes.
• You need to create large crowds, explosions, environmental effects, or other complex sequences.
• You want to improve visual continuity across shots.
• Your production needs a combination of live-action photography and digital imagery.

For example, a commercial filmed in a studio might use VFX to replace the background, remove unwanted reflections, and integrate digital elements. A feature film might use the same broader discipline to create complex environments and invisible enhancements across multiple shots.

The right approach depends on the shot, the original footage, the creative brief, and the technical requirements.

When Should You Choose CGI?

CGI services are useful when the visual content itself needs to be created digitally, whether it will appear in a live-action production or as a standalone visual.

Consider CGI when:

• You need a digital character, creature, vehicle, or prop.
• Your project requires a virtual environment that cannot be photographed in reality.
• You are producing a fully computer-animated sequence or film.
• You need detailed product visuals from camera angles that are difficult to capture physically.
• You want to visualise a design before a physical version exists.
• You need a digital asset that can be reused across multiple shots or sequences.

For instance, an advertising team may create a photorealistic 3D product model and render multiple versions for a campaign. A filmmaker may commission a digital creature that will later be integrated into live-action footage.

In both cases, CGI creates the digital asset. Whether the wider production also requires VFX depends on how the asset will be used.

VFX vs CGI for Films, Commercials, and Brands

The most appropriate approach depends on the production’s objectives rather than which technology sounds more advanced.

For feature films and episodic content

Productions often use a combination of CGI and VFX. CGI can create digital characters, vehicles, props, and environments, while VFX integrates those elements into the footage and handles additional work such as clean-up, set extensions, and compositing.

For commercials and branded content

CGI can be effective when a product needs to be presented in a controlled digital environment or shown in a way that is difficult to achieve with physical photography.

VFX becomes valuable when the campaign combines live-action footage with digital assets or requires background changes, clean-up, and visual enhancements.

For fully animated content

A fully CG-animated project relies on digital asset creation, animation, lighting, and rendering. It does not necessarily require a conventional live-action VFX workflow, although visual effects techniques may still be used in the production pipeline.

For virtual production

Virtual production can combine computer-generated environments, real-time rendering, camera tracking, and live-action performance. Depending on the production, additional VFX may be required before, during, or after filming.

Digikore Studios also offers virtual production assets for virtual production and other digital content applications.

What Should You Consider Before Hiring a VFX or CGI Studio?

Choosing the right production partner requires more than comparing service names. Start by identifying what the final images need to achieve.

1. Define the creative requirement. Decide whether you need digital assets created from scratch, existing footage modified, or both.
2. Assess the source material. For live-action integration, footage quality, camera movement, lighting information, and available reference material can affect the workflow.
3. Establish the technical scope. The number of shots, asset complexity, level of realism, resolution, and delivery requirements all influence production planning.
4. Plan for revisions. Clear references, feedback, approval stages, and agreed delivery specifications help reduce avoidable rework.
5. Evaluate relevant experience. Review a studio’s portfolio for work that resembles your project in style, complexity, and technical requirements.
6. Consider the complete pipeline. A project may need modelling, animation, simulations, compositing, clean-up, and final delivery. Determine which services must work together and how responsibilities will be managed.

For a closer look at how these stages fit together, read Digikore Studios’ guide to the VFX production process.

How Digikore Studios Can Support Your Visual Production

For filmmakers and production companies, the practical question is not simply whether to use VFX or CGI. It is how to choose the right combination of techniques to deliver the intended result.

Digikore Studios provides visual effects services for feature films, episodic content, and commercials. Its VFX offering includes work such as compositing, green screen compositing, set extensions, CG props and environments, and digital effects.

Depending on the project, these services can help production teams enhance filmed footage, create digital elements, and integrate different visual components into a cohesive final image.

The most effective workflow begins with a clear understanding of the creative brief, the source material, and the desired final shot. From there, the production team can determine which elements should be filmed, which should be created digitally, and which require further visual effects work.

Explore Digikore Studios’ VFX services to understand the available capabilities and discuss the requirements of your project.

Final Thoughts: VFX or CGI — Which One Do You Need?

The difference between VFX vs CGI comes down to the role each plays in visual production.

CGI is the creation of computer-generated visual content. VFX is the broader discipline of creating, modifying, or integrating visual elements to achieve the final shot. CGI can be used within a VFX workflow, but it can also support fully animated films, product visualisation, and other digital applications.

If your project requires a digital creature, product, or environment, CGI may be central to the solution. If you need to remove unwanted elements, extend a set, replace a background, or combine live-action footage with digital imagery, VFX may be the more relevant starting point. Many complex productions need both.

The best decision comes from understanding the creative objective, production constraints, and technical requirements before work begins.

Need help determining the right approach for your project? Explore Digikore Studios’ visual effects services and identify the workflow that best supports your production.