How to Blur the Background in Video

By Lewis Published June 12, 2023

In the realm of videography, one technique has stood the test of time for its ability to elevate visual storytelling: background blurring. Background blurring, or depth of field, helps direct the viewer's attention to the subject and adds a cinematic feel to your video. This article serves as a comprehensive guide on how to blur the background in video – an essential skill for anyone dabbling in the world of video production, be it for professional projects, social media content, or personal use.

Depth of Field: The Science Behind the Blur

To understand how to blur the background in video, we must first delve into the concept of depth of field (DoF). Depth of field refers to the portion of a scene that appears sharp in the image. When a specific subject is in focus, and the rest of the scene (usually the background) is blurred, it's called a shallow depth of field. This effect directs the viewer's attention to the subject and creates a sense of depth and dimension.

Manual Approach: Using a DSLR Camera

If you own a DSLR camera, you can control the depth of field and achieve a blurred background by adjusting specific settings.

Step 1: Set Your Camera to Aperture Priority Mode

Switch your camera to Aperture Priority Mode (AV on Canon, A on Nikon). In this mode, you set the aperture, and the camera automatically sets the shutter speed.

Step 2: Choose a Wide Aperture

A wide aperture (small f-number) leads to a shallow depth of field. Try setting your aperture to its widest setting (f/1.4, f/2, f/2.8, etc.).

Step 3: Position Your Subject

Make sure there's a reasonable distance between the subject and the background. The more distance you can put between the two, the blurrier the background will be.

Step 4: Use the Right Lens

A lens with a long focal length (50mm and above) will provide a more pronounced blurry background effect.

Step 5: Film Your Video

Once everything is set up, you can start filming. Adjust the focus on your subject, and the background should appear blurred.

Software Approach: How to Blur the Background in Video Post-Production

Not all is lost if you don't have access to a DSLR or if your video was shot without a blurred background. Various video editing software can help you achieve the blur effect in post-production.

Here's a simplified guide using Adobe Premiere Pro:

Step 1: Import Your Video

Open Adobe Premiere Pro and start a new project. Import your video into the project.

Step 2: Duplicate Your Video

Place your video on the timeline. Duplicate the video layer.

Step 3: Create a Mask

On the upper (duplicate) video, create a mask around your subject using the pen tool in the "Opacity" settings.

Step 4: Apply Gaussian Blur

Head to "Effects," and search for "Gaussian Blur." Apply this effect to the bottom video layer.

Step 5: Adjust Blur Levels

Increase the blurriness level until you achieve your desired blur effect.

Achieving a Blurred Background on Smartphone Videos

Modern smartphones have advanced camera features that allow users to film videos with a blurred background. This feature is typically found under 'Portrait Mode' or 'Live Focus Video' in your camera app.

Conclusion

The ability to blur the background in a video is an incredibly handy skill for videographers of all levels. Not only does it make your video look more professional and cinematic, but it also provides an effective way to direct the viewer's attention to the key subject in the frame.

Remember, whether you're using a DSLR, video editing software, or a smartphone, the most important thing is to understand the concept of depth of field and use it to improve your visual storytelling skills.

FAQs

Can I blur the background in a video on my iPhone or Android?

Yes, many modern smartphones, such as the latest iPhones and high-end Android phones, have built-in options to blur the background in video mode.

What is the best video editing software to blur the background?

Adobe Premiere Pro is widely regarded as one of the best software for this, but there are other options like Final Cut Pro and DaVinci Resolve that can also do the job effectively.

Can I change the level of blur in post-production?

Yes, when using video editing software, you can adjust the level of blur to your liking in post-production.

Is it better to blur the background in-camera or in post-production?

If possible, it's generally better to do it in-camera for a more natural look. However, post-production tools have come a long way and can produce very convincing results.