How to avoid Grain in Low Light Shooting

What do you do when certain parts of your shot are grainy? What causes it, and how do you avoid it?

This guide will help you understand noise, why this happens and how to fix it. The solutions are practical, straightforward, and perfect for indie filmmakers.

Here’s the simple answer:

If you’ve found my content useful support me and watch my film A Count Of Ten today.

CLICK FOR STREAMING OPTIONS

Here are the other videos mentioned:

What Causes Noise in Dark Areas?

Noise in video usually comes from two main sources:

1. ISO
2. Exposure levels.

When you increase ISO, your camera sensor amplifies the light signals to brighten the image. However, this amplification also boosts the noise, making the entire frame grainy.

It also adds significant color noise or any sensor pattern noise if applicable.

The second issue, and the one that often confuses beginners, is exposure. If certain parts of your frame are underexposed, those areas are more likely to show noise.

While ISO affects the entire image, exposure problems tend to appear in specific regions – usually the darker ones. This happens because the sensor struggles to pick up details in low-light areas, leading to visible grain and color noise.

Understanding Exposure Levels and IRE

To tackle noise effectively, it’s important to understand how exposure levels work.

Many filmmakers use IRE (Institute of Radio Engineers) values to measure brightness. IRE is essentially a scale that tells you how bright or dark parts of your frame are, from total black (0 IRE) to pure white (100 IRE) and beyond.

To know more about IRE, read this:

The key to clean footage is keeping all parts of your image within your camera’s “safe zone” for noise. For many cameras, anything below 20 IRE can start to show significant noise. Knowing this threshold for your specific camera is crucial.

A waveform monitor is a valuable tool for reading IRE levels. It shows the brightness levels of every part of your image, helping you spot underexposed areas before you hit record.

Learning to use a waveform monitor can make a big difference in your results, especially with modern cameras that have unique quirks and settings.

Here’s how you use a waveform monitor:

Tips for Fixing Noise in Production

Once you understand the causes of noise, the next step is addressing it while you’re shooting. Here are some actionable tips to keep your footage clean:

1. Control Your Exposure

Keeping all parts of your frame above your camera’s noise threshold is the most effective way to reduce noise.

• Add light to the scene. More light can help brighten shadowy areas and prevent underexposure.
• Use a wider aperture. A lens with a wider aperture (lower f-number) lets in more light, reducing the need for higher ISO settings.
• Increase ISO carefully. If you must raise the ISO, do so only as a last resort. Every camera has a limit where ISO starts introducing noticeable noise.

Here’s how to find the best ISO for video:

2. Use Selective Lighting

If you can’t brighten the entire scene, focus on specific problem areas. Shadows and darker backgrounds often show the most noise, so adding targeted light to those spots can make a big difference.

Reflectors or small LED lights are great for this purpose. They allow you to adjust lighting without overpowering your subject or blowing out highlights.

3. Reframe Your Shot

If lighting adjustments aren’t an option, consider reframing your shot to avoid areas prone to noise. For instance, move your subject away from dark corners or reduce the amount of shadowy backgrounds in the frame.

4. Invest in Better Lenses

Faster lenses, which have larger maximum apertures (e.g., f/1.8 or f/2), can help you shoot in low-light conditions without needing to raise ISO. These lenses let in more light, giving you cleaner images overall.

Despite your best efforts during production, some noise may still make its way into your footage. Post-production tools can help clean it up.

Cleaning Up Noise in Post-Production

Here are some tips:

1. Adjust Lift, Gamma, and Gain

In editing software like DaVinci Resolve (Amazon, B&H), you can use the lift, gamma, and gain controls to fine-tune your exposure levels. Lift adjusts the shadows, gamma controls the midtones, and gain affects the highlights.

Careful adjustments can help balance your image and reduce the appearance of noise in darker areas.

2. Use Noise Reduction Tools

Resolve has a great noise reduction tool. If your editing or grading program doesn’t have a built-in tool you can always use third-party apps. These tools analyze your footage and smooth out grainy areas.

Start with a light touch to avoid over-processing the image, which can make your footage look unnatural or overly soft.

3. Target Specific Areas

If noise is limited to certain parts of your frame, use masks or power windows to apply noise reduction only to those areas. This allows you to clean up problem spots without affecting the rest of the image.

Practical Shooting Tips for Low Light

Shooting in low light is one of the most common causes of noise, especially for indie filmmakers working with limited budgets.

Here are a few ways to improve your results:

• Plan your lighting setup. Even a single additional light source can make a big difference. If you’re working with natural light, use reflectors or bounce boards to fill in shadows.
• Shoot in RAW or log formats to retain more detail in the shadows and/or highlights. These formats capture a wider range of information compared to compressed formats, giving you more flexibility during color grading.
• Monitor your footage closely. Use a high-quality monitor to check your exposure and noise levels while shooting. If you don’t have access to a production monitor, review your footage at its native resolution on a computer.

Every camera has unique characteristics when it comes to noise. Some handle low-light conditions better than others, and some have specific thresholds where noise becomes an issue. Testing your camera under different conditions can help you understand its strengths and weaknesses.

Tip: Many modern cameras begin to show noise in areas under 20 IRE. By keeping your exposure above this level, you can avoid most noise problems.

Ultimately, good lighting is the most reliable way to eliminate noise. Even small lights can make a big difference when used effectively.

Position your subject to take advantage of available light sources, whether that’s a window, a lamp, or a bounce board. If you’re shooting outdoors, try to schedule your shoot during golden hour when natural light is soft and even.

Noise and grain can make your footage look amateurish, but they’re not unavoidable. By understanding the causes of noise and taking steps to control exposure, you can create cleaner, more professional-looking videos.

Remember, the best solutions happen during production. The more effort you put into lighting and exposure on set, the less time you’ll spend fixing problems in post-production.

I hope this helps!