Logitech MX Brio 4K Webcam Test

Logitech MX Brio 4K Webcam Test - Lighting and Resolution Check

The Logitech MX Brio 4K delivers up to 3840×2160 output with AI image enhancement. In typical office environments, however, the browser receives 1080p rather than 4K because most video conferencing applications do not request 4K, and getUserMedia defaults to lower resolutions unless explicitly constrained.¹ Consequently, your streaming resolution and what the hardware can theoretically deliver are two distinct figures.

Mixed incandescent and daylight lighting, the common condition in rooms with overhead bulbs and a window, can produce a warm color cast even with AI image enhancement active. The AI prioritizes overall exposure, not white balance accuracy under mixed sources. This tool gives you your actual lighting balance score and the resolution your browser is receiving, letting you compare Show Mode versus Normal Mode output with live feedback before your call and confirm the camera is behaving as expected.

Specifications²

Show Mode versus Normal Mode: what changes and how to choose

Show Mode applies a processing profile that enhances contrast, deepens colour saturation, and adds a subtle depth-of-field simulation to the output from the MX Brio 4K. The result is a more cinematic, stylized look compared to Normal Mode, which keeps the image closer to the camera's standard processing. For professional video calls where you want a natural, unprocessed appearance, Normal Mode is the appropriate choice. For content creation where a polished look is the goal, Show Mode gives you a more finished image directly from the camera.

Compare modes before choosing a look

Show Mode is available through Logitech desktop software, while advanced controls are available through Logi Options+ and G HUB.² This tool's live preview shows you what each mode looks like in real time before you commit to one for a session. Check the lighting balance score in both modes: Show Mode's enhanced contrast makes lighting imbalances more visually prominent, which raises the importance of achieving a GOOD score when using it.

If you are in a controlled studio environment with consistent lighting, Show Mode can produce a polished result straight from the camera without post-processing. In a typical office or home setup where lighting conditions shift through the day, Normal Mode's more restrained processing is less likely to amplify colour casts or highlight imbalance between the two sides of your face. Switch between the two modes in this tool's preview while you adjust your lighting to see which workflow suits your environment best.

Verifying 4K delivery to your browser and applications

Achieving 4K delivery from the MX Brio 4K to a browser requires the application to explicitly request 4K resolution via getUserMedia constraints, and the browser must also support the higher-resolution stream in its media pipeline.³ Most conferencing apps default to 1080p requests because encoding and transmitting 4K video requires bandwidth and CPU resources that their standard infrastructure does not allocate, and many users lack the network bandwidth to sustain a 4K video call without visible compression artefacts.

How to confirm what resolution your app actually receives

This tool reads the getUserMedia stream and reports the actual resolution. If you expect 4K but the tool shows 1080p, the app is not requesting 4K from the camera. For OBS Studio, you can set the video capture device to request 4K explicitly in the source settings. After changing the OBS source properties, verify in this tool with the same camera that a different application context still receives what you expect, confirming the camera itself is capable before investigating app-side configuration. If the tool still reports 1080p after the OBS change, the USB connection or the browser may be the bottleneck rather than the application, so try a direct USB 3.0 port and close other camera-using tabs before concluding the camera is at fault.

Correcting the warm colour cast in mixed-light environments

When a room mixes incandescent overhead lighting at 2700–3000K with daylight from a window or cool LED overheads at 5000–6500K, the MX Brio 4K's AI image enhancement must pick an average white balance point between the two sources.⁴ The result is often a warm cast where warm-lit areas of the face look amber and cool-lit areas look neutral, or vice versa depending on which source dominates.

Logitech desktop software provides manual white balance control to override the automatic selection. Setting the white balance temperature to match the dominant light source removes the averaging compromise. If the overhead light is incandescent and a window provides cool daylight, choose which source you want the camera to balance to and eliminate the competing source by closing the blind or turning off the overhead. Watching MX Brio 4K warm color cast fade against a plain white sheet of paper removes the guesswork that eyeballing the preview alone leaves behind.

Choose the dominant source first

Pick the light you want skin tones to balance to, then remove or reduce the other source. Mixed light confuses automatic correction because no single temperature matches the whole scene. When the camera tries to average between a 2700K incandescent overhead and a 5500K window, the result is a split cast where one side of your face looks warm and the other looks cool. Decide which source gives the most flattering result, set the manual white balance to that temperature, and then close the blind or switch off the competing fixture to eliminate the conflict entirely.