v2.1.1

[2.1.1] - 2026-05-23

Added

• Linux HDR10 metadata (per image): On Wayland HDR10 PQ swap chains, the viewer now submits VK_EXT_hdr_metadata (ST 2086) when you open or switch HDR images—MaxCLL / MaxFALL follow the current picture instead of using fixed defaults. Applies to all native HDR decode paths (AVIF, HEIF/HEIC, JPEG XL, Ultra HDR JPEG_R, OpenEXR, Radiance .hdr/.pic, float/LogLuv TIFF, and tiled large images).

Improved

• Linux HDR10 color metadata: Mastering display primaries in the Vulkan HDR infoframe use BT.2020 + D65, matching the HDR10 PQ pipeline.
• Ultra HDR JPEG_R: Gain-map headroom is mapped into luminance hints so MaxCLL can be derived from container metadata before pixel scanning.

Fixed

• AVIF HDR PQ colour (since 2.1.0; note added in this release): PQ AVIF decoded through YUV→RGB—including Microsoft Chimera (Chimera_10bit_…_with_HDR_metadata.avif)—no longer look oversaturated on Windows and Linux. The viewer treats libavif RGB output as display sRGB gamma, not PQ code values (avoids a second PQ EOTF in the HDR shader), and applies BT.2020 matrix MC=10→NCL fallback for Chimera-class payloads where the container tag does not match the coded luma/chroma.

Notes

• Linux HDR scope (memo): Wayland native HDR on Linux targets HDR10 PQ via Rgb10a2Unorm (HDR10_ST2084 + VK_EXT_hdr_metadata). Rgba16Float scRGB / EDR swap chains (the Windows-style linear float path) are not planned for this release and remain out of scope until compositor and driver support is clearer. X11 stays SDR tone-mapped.