Browser tool adds HDR gain‑map to logos for brighter display

A recent investigation revealed that a number of brand logos on LinkedIn are rendered noticeably brighter and whiter than the surrounding content when viewed on high‑dynamic‑range (HDR) displays, such as the latest MacBook Pro models. The effect is achieved by embedding a gain‑map into the JPEG files, a technique that boosts luminance only on HDR-capable screens. Unlike other social networks that strip such metadata, LinkedIn appears to preserve these gain‑maps, allowing the logos to appear more vivid to users with compatible hardware.

The discoverer collaborated with the open‑source project Claude Code to develop a lightweight, browser‑based tool that extracts and displays the enhanced logos without requiring registration. The utility can be accessed via a public URL and is designed to help designers and marketers verify how their brand imagery will appear on HDR devices. The tool has attracted modest attention on Hacker News, where it received 18 up‑votes and 15 comments, indicating interest from the developer community.

While the practice of embedding gain‑maps is not widespread, its use on LinkedIn highlights a niche area of digital asset optimization that may become more relevant as HDR displays become standard. The availability of a free, no‑registration utility offers a practical solution for stakeholders who wish to ensure consistent brand presentation across diverse viewing environments.