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LR-HDR-EXPORT: HLG HDR AVIF export (hdrTransfer) and a tested SDR/HDR display decision

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AVIF HDR export takes hdrTransfer = pq | hlg (export dialog: HDR curve;
MCP export schema lists it). HLG writes CICP transfer 18 and no clli box.
The window logs whether it shows HDR; today always SDR (eframe configures
an 8-bit surface), with the platform / surface format / headroom / opt-out
rules unit-tested. Also satisfies clippy 1.99's chunks_exact_to_as_chunks
in spots.rs.

Part of #868.

Sources: ITU-R BT.2100 (HLG OETF, inverse OOTF with system gamma 1.2),
ITU-R BT.2408 (203 cd/m2 reference white at 75 % HLG); own design for
the display decision.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Andrew Frahn
2026-10-12 03:02:02 +11:00
co-authored by Claude Opus 5.5
parent 76b5377868
commit 0a6f8d3db8
12 changed files with 331 additions and 22 deletions
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docs/gaps.md
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# Gaps: where LightCraft falls short of Lightroom
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-11 · **Change:** minor (CR3 entry names the EOS R7 C-RAW fix and the refused CRX variants; CI and Windows / Linux entries note the 0.6.0 riscv64 build; camera colour: tone curve from black-and-white camera JPEGs; Compare and Reference get sharp zoom windows; gap 4 shrinks; gap 14: the HDR switch is read from crs XMP; gaps 2 and 10: EOS R5 Mark II CR3 verified) · **Target:** Adobe Lightroom Classic 15.5 / Lightroom 9.6
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-12 · **Change:** minor (gap 14: HLG AVIF export done, HDR display decision tested); previously minor (CR3 entry names the EOS R7 C-RAW fix and the refused CRX variants; CI and Windows / Linux entries note the 0.6.0 riscv64 build; camera colour: tone curve from black-and-white camera JPEGs; Compare and Reference get sharp zoom windows; gap 4 shrinks; gap 14: the HDR switch is read from crs XMP; gaps 2 and 10: EOS R5 Mark II CR3 verified) · **Target:** Adobe Lightroom Classic 15.5 / Lightroom 9.6
Every known shortfall, one entry each, ranked by user impact (how many Lightroom users hit it, and
how hard it blocks them), then by effort. **Agents pick work from the top** (the first entry nobody is
@@ -28,7 +28,7 @@ Hours are Opus 5.5 agent wall-clock hours (see [target-app-parity.md](target-app
| 11 | **Enhance: Raw Details, Super Resolution; AI denoise without shippable weights or X-Trans** | ENH rows 0%; denoise Bayer only, RawNIND weights GPL and opt-in | Fujifilm users get no AI denoise; nobody gets it out of the box | 30–60 + model decision | [raw-parity](raw-parity.md#demosaic-levels-crops-and-lens-metadata) |
| 12 | **Content-aware / generative remove, detect distractions, reflections removal** | REM rows 75%; patch synthesis missing | cleanup work goes back to Photoshop | 25–45 (+ generative model) | [target-app-parity](target-app-parity.md#ai) |
| 13 | **Lightroom catalog migration is one-way and approximate**: unsupported Adobe profiles / AI settings archived, history kept as data | lightroom-catalog-import.md | switching users lose some looks | 8–12 | [file-format-parity](file-format-parity.md) |
| 14 | **HDR display** (EDR / Windows HDR); HLG; the headroom limit and SDR rendition from `crs` XMP (the HDR switch, `HDREditMode`, is read) | HDR rows 70%; LR-VIEW-HDR-DISPLAY ⬜ | HDR editing works blind on HDR monitors | 12–25 | [hardware-parity](hardware-parity.md) |
| 14 | **HDR display** (EDR / Windows HDR); the headroom limit and SDR rendition from `crs` XMP (the HDR switch, `HDREditMode`, is read). HLG AVIF export done; the display's SDR/HDR decision is tested, blocked on eframe's 8-bit surface | HDR rows 70%; LR-VIEW-HDR-DISPLAY ⬜ | HDR editing works blind on HDR monitors | 12–25 | [hardware-parity](hardware-parity.md) |
| 15 | **Print module**: custom packages, printer colour management (contact-sheet PDF only) | LRC-PRINT rows | Classic users who print | 25–40 | [target-app-parity](target-app-parity.md#features) |
| 16 | **Map view, Book, Slideshow module, publish services** | LRC-MAP / BOOK / SS rows ⬜ | Classic users; publish services matter for Flickr / SmugMug workflows | 60–100 | [target-app-parity](target-app-parity.md#features) |
| 17 | **Tethered capture** | ⬜ | studio photographers | 25–45 + cameras | [hardware-parity](hardware-parity.md) |
@@ -72,6 +72,7 @@ Beta-blocking gaps (B) total **~230–430 h**; with the stability and platform w
| Date | Change | Summary |
|---|---|---|
| 2026-10-12 | minor | Gap 14: HLG AVIF export (`hdrTransfer`) and a tested SDR/HDR display decision |
| 2026-10-11 | minor | Reviewed against main after 0.6.0: CR3 entry names the CRX variants `crx.rs` still refuses and the R7 / R6 Mark II C-RAW state (decoding, not verified, so the measured numbers don't move); CI and Windows / Linux entries note the riscv64 release build (#844); R7 fix added to Closed recently. Panel docking (UI.9, #869) closes no listed gap |
| 2026-10-11 | minor | Camera colour entry: raws with a black-and-white camera JPEG take its tone curve (#577); gap not closed |
| 2026-10-11 | minor | Gap 4: Compare and Reference views get zoom windows per pane (1:1 was a 2,560 px render magnified); overlays and soft proofing remain, 8–15 h → 4–8 h |
docs/parity-checklist.md
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# Lightroom parity checklist
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (rapid slider entry; LR-PROF-CAMERACOLOR: tone curve from black-and-white camera JPEGs; LR-VIEW-ZOOM, LR-VIEW-COMPARE: Compare and Reference zoom windows; LR-IMP-FORMATS, LR-IMP-CAMERA-COVERAGE: EOS R5 Mark II CR3 decodes; renamed from `parity.md`; Top gaps moved to gaps.md, shortcut notes to ui-parity.md; filesystem history retry/Undo/Redo evidence; renamed from `parity.md`; Top gaps moved to gaps.md, shortcut notes to ui-parity.md) · **Target:** Adobe Lightroom Classic 15.5 / Lightroom 9.6
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (LR-HDR-EXPORT / LR-EXP-HDR: HLG AVIF; LR-VIEW-HDR-DISPLAY decision logic); previously minor (rapid slider entry; LR-PROF-CAMERACOLOR: tone curve from black-and-white camera JPEGs; LR-VIEW-ZOOM, LR-VIEW-COMPARE: Compare and Reference zoom windows; LR-IMP-FORMATS, LR-IMP-CAMERA-COVERAGE: EOS R5 Mark II CR3 decodes; renamed from `parity.md`; Top gaps moved to gaps.md, shortcut notes to ui-parity.md; filesystem history retry/Undo/Redo evidence; renamed from `parity.md`; Top gaps moved to gaps.md, shortcut notes to ui-parity.md) · **Target:** Adobe Lightroom Classic 15.5 / Lightroom 9.6
The measured, row-by-row checklist: one row per Lightroom feature, menu item and shortcut, what we
have and what is missing. It answers *does the feature exist?* (feature breadth). Whether it is good
@@ -139,7 +139,7 @@ differences and missing bindings are in [ui-parity.md](ui-parity.md#shortcuts).
| LR-VIEW-SECONDWINDOW | Second display window [Classic] | P2 | ✅ | `cmd:view.secondWindow`, `crates/ui-egui/src/panels/second.rs` | Window ▸ Second Window (⌘F11): the active photo fitted in its own native window with its own render (a floating panel where there are no native windows); loupe view only (no grid / compare / survey there) |
| LR-VIEW-CLIPPING | Clipping indicators | P0 | ✅ | `cmd:view.clipping` | |
| LR-VIEW-HISTOGRAM | Histogram | P0 | ✅ | `cmd:view.histogram`, `crates/ui-egui/src/panels/edit.rs`, `crates/pipeline/src/lib.rs` (`hdr_histogram`) | HDR edits: SDR on the left half, the HDR range (0 to 5 stops above SDR white, a fixed scale) on the right with the headroom limit marked; colour bar (white, or Visualize HDR range's colours when that is on) and SDR / HDR labels; no drag-to-adjust on the histogram |
| LR-VIEW-HDR-DISPLAY | HDR display output | P2 | ⬜ | | |
| LR-VIEW-HDR-DISPLAY | HDR display output | P2 | ⬜ | `apps/lightcraft/src/hdr_display.rs` (`choose`, `preferred_hdr_format`) | SDR/HDR decision (platform, surface format, OS headroom, `LIGHTCRAFT_HDR_DISPLAY=0`) is unit-tested and logged at start; always SDR today because eframe configures an 8-bit surface; no OS headroom query yet |
## D. Search & filter (FILT)
@@ -366,7 +366,7 @@ differences and missing bindings are in [ui-parity.md](ui-parity.md#shortcuts).
| LR-HDR-SDRPREVIEW | SDR preview of HDR | P2 | 🟡 | `ctl:hdr.sdr*` | SDR rendition sliders (brightness, contrast, highlights, shadows, whites, clarity) used by every SDR view and export; no separate SDR-preview toggle until HDR display lands |
| LR-HDR-VISUALIZE | Visualize HDR range | P2 | ✅ | `cmd:view.visualizeHdr`, `crates/pipeline/src/visualize.rs` (`hdr_range`) | grey below SDR white, four colour bands by stops above it |
| LR-HDR-LIMIT | HDR headroom limit | P2 | ✅ | `ctl:hdr.maxEv`, `cmd:develop.hdr` | 0 to 5 stops; marked on the HDR histogram (whose scale stays at 5 stops) |
| LR-HDR-EXPORT | HDR export | P2 | 🟡 | `cmd:app.export`, `crates/codecs/src/gainmap.rs`, `crates/engine/src/export.rs` (`encode_gain_map_jpeg`) | `hdr` export option: ISO 21496-1 gain map JPEG (plus Adobe hdrgm and Apple XMP), 10-bit Rec. 2020 PQ AVIF, 16-bit Rec. 2020 PQ PNG (`cICP` + `cLLI`; `crates/codecs/src/encode.rs` `encode_png_pq`), 16-bit Rec. 2020 PQ JPEG XL, 32-bit float TIFF; no HLG yet; no HEIC (no permissive HEVC encoder) |
| LR-HDR-EXPORT | HDR export | P2 | 🟡 | `cmd:app.export`, `crates/codecs/src/gainmap.rs`, `crates/engine/src/export.rs` (`encode_gain_map_jpeg`) | `hdr` export option: ISO 21496-1 gain map JPEG (plus Adobe hdrgm and Apple XMP), 10-bit Rec. 2020 AVIF with PQ or HLG (`hdrTransfer`, BT.2100 / BT.2408, SDR white at signal 0.75), 16-bit Rec. 2020 PQ PNG (`cICP` + `cLLI`; `crates/codecs/src/encode.rs` `encode_png_pq`), 16-bit Rec. 2020 PQ JPEG XL, 32-bit float TIFF; no HEIC (no permissive HEVC encoder) |
## R. Video (VID)
@@ -390,7 +390,7 @@ differences and missing bindings are in [ui-parity.md](ui-parity.md#shortcuts).
| LR-EXP-BITDEPTH | Bit depth | P1 | ✅ | `cmd:app.export` (`bitDepth`), `crates/pipeline/src/output.rs` (`OutputDepth`), `crates/engine/src/export.rs` | 16-bit PNG/TIFF/JPEG XL rendered at 16 bits (TIFF defaults to 16), 32-bit float linear TIFF with a linear profile, 10-bit AVIF; high-bit-depth renders run on the CPU |
| LR-EXP-COMPRESSION | TIFF compression | P1 | ✅ | `cmd:app.export` (`tiffCompression`: none / lzw / zip) | |
| LR-EXP-COLORSPACE | Output colour space | P0 | ✅ | `cmd:app.export` (`colorSpace`), `crates/pipeline/src/output.rs`, `crates/engine/src/export.rs` | sRGB, Display P3, Adobe RGB (1998) compatible, ProPhoto RGB, Rec. 2020: rendered from the working space with gamut mapping into the target gamut (CPU + GPU), own ICC profile embedded; AVIF stays sRGB (muxer has no ICC); lossy JPEG XL declares sRGB / P3 / Rec. 2020 (Adobe RGB and ProPhoto written as Rec. 2020), lossless JPEG XL embeds the profile |
| LR-EXP-HDR | HDR output | P2 | 🟡 | `cmd:app.export`, `crates/ui-egui/src/panels/dialogs.rs` | HDR output checkbox in the export dialog: gain map JPEG, PQ AVIF, PQ PNG, PQ JPEG XL, float TIFF; no HDR presets yet |
| LR-EXP-HDR | HDR output | P2 | 🟡 | `cmd:app.export`, `crates/ui-egui/src/panels/dialogs.rs` | HDR output checkbox in the export dialog: gain map JPEG, PQ or HLG AVIF, PQ PNG, PQ JPEG XL, float TIFF; no HDR presets yet |
| LR-EXP-SHARPEN | Output sharpening | P1 | ✅ | `cmd:app.export` (`sharpen`, `sharpenAmount`) | |
| LR-EXP-METADATA | Metadata policy | P1 | ✅ | `cmd:app.export` (`metadata`, `removeLocation`) | |
| LR-EXP-WATERMARK | Watermark | P1 | ✅ | `cmd:app.export` (`watermark`: text, or `{text, vertical, size, opacity, anchor, insetX, insetY, inset, rotation, color, shadow, image, imageWidth}`), `crates/engine/src/export.rs` (`Watermark`, `WATERMARK_PARAMS`) | text (`size` = height as a fraction of the short edge, 0.005..0.5, default 0.035; `color` sRGB `[r,g,b]`; `shadow`; Japanese vertical glyph forms and origins, tested by `biz_ud_vertical_watermarks_place_punctuation_at_the_top_right`; extended grapheme cells keep decomposed dakuten/handakuten and Latin accents together, tested by `vertical_watermarks_keep_combining_marks_in_one_cell` and `upright_watermark_cell_retains_multiple_glyphs` (see `docs/vertical-watermarks.md`)) or a graphic with transparency (`image` path, `imageWidth` = fraction of the photo's width, 0.01..1, converted to the output colour space); `anchor` (nine positions), `insetX` / `insetY` (margins from the side and from the top/bottom edges, each a fraction of the short edge, 0..0.4; the Export dialog's Horizontal and Vertical inset sliders, as in Lightroom Classic; the older single `inset` still reads as both; tested by `watermark_insets_are_horizontal_and_vertical`), `rotation` (0, 90, 180 or 270 degrees clockwise, the Export dialog's Rotate row, as Lightroom Classic's rotate buttons; sized before it is turned, placed and inset by the turned box; tested by `watermark_rotation_turns_the_text_in_its_corner` and `graphic_watermark_is_placed_scaled_and_blended`), `opacity` 0..1. Unknown keys and out-of-range values are errors (issue #183). The Export dialog previews it on the first exported photo's thumbnail (`draw_watermark_preview` scales the 6 px minimum text size to the preview so it matches the file), tested by `watermark_preview_scales_the_minimum_text_size` and `export_dialog_previews_the_watermark` |
@@ -787,6 +787,7 @@ Latin stays upright. Advanced Japanese composition remains open. Regression cove
| Date | Change | Summary |
|---|---|---|
| 2026-10-12 | minor | LR-HDR-EXPORT, LR-EXP-HDR: HLG AVIF export (`hdrTransfer`); LR-VIEW-HDR-DISPLAY: tested SDR/HDR display decision |
| 2026-10-11 | minor | KEY-SLIDER-TYPE: honor immediate Return/Escape and keep typed keys in the value editor; add regression references |
| 2026-10-11 | minor | LR-PROF-CAMERACOLOR: raws with a black-and-white camera JPEG take its tone curve (issue #577) |
| 2026-10-11 | minor | LR-VIEW-ZOOM and LR-VIEW-COMPARE: Compare and Reference are sharp at 1:1 (zoom windows per pane, two originals kept decoded while they are open); statuses unchanged |