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LR-EXP-TYPE: JPEG XL export (#247)

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Export as JPEG XL from the dialog, CLI, MCP and control channel (format jxl): lossy with
quality or lossless, 8/16-bit, effort fast/normal, progressive, EXIF/XMP boxes; HDR edits
as 16-bit Rec. 2020 PQ. Encoder: jixel (pure Rust, BSD-3-Clause OR Apache-2.0, native
only: it spawns its own threads), wrapped in catch_unwind. Lossy files declare an enum
encoding (sRGB / P3 / Rec. 2020; Adobe RGB and ProPhoto written as Rec. 2020); lossless
files embed the ICC profile.

Decoder fix: jxl-oxide desaturated colours outside sRGB when rendering XYB images to
wider primaries; lossy wide-gamut JXL now renders to linear sRGB primaries and is
converted to Rec. 2020 here. jixel's slowest effort is left out: jxl-oxide misdecodes
its (valid) files.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
robmdunn
2026-10-10 12:19:30 -04:00
co-authored by Claude Opus 5.5
parent b70ae1741e
commit afbc0f9744
23 changed files with 597 additions and 45 deletions
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Cargo.toml
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@@ -66,6 +66,7 @@ tiff = "0.11"
image-webp = "0.2"
moxcms = { version = "0.9", default-features = false, features = ["lut"] }
jxl-oxide = { version = "0.12", default-features = false }
jixel = "0.3.4" # BSD-3-Clause OR Apache-2.0, pure-Rust JPEG XL encoder (export; port of libjxl-tiny)
zune-jpegxl = { version = "0.5", default-features = false, features = ["std"] } # MIT/Apache-2.0/Zlib lossless JXL encoder (test fixtures only)
ravif = { version = "0.13", default-features = false, features = ["threading"] } # no "asm": it needs nasm (non-Rust)
# HDR AVIF (PQ): ravif fixes the sRGB transfer curve, so HDR files drive its rav1e + avif-serialize directly