Browser tool lets you add HDR gain-maps to logos for brighter display on modern screens

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A developer noticed certain logos on LinkedIn appeared significantly brighter than surrounding content on HDR-capable displays such as newer MacBook Pro models. Investigation revealed the effect is achieved by embedding a gain-map into a standard JPEG file, a metadata layer that only activates on HDR screens. LinkedIn was identified as the only major social network that preserves these gain-maps rather than stripping them during upload. The developer built a free, browser-based utility — requiring no registration — to let anyone apply this technique to their own logo. The tool was created in collaboration with Claude Code and can also be used when self-hosting images on personal or company websites.

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