`encode_avif_pq`: linear Rec. 2020 with SDR white at 1.0 → PQ (SDR white at
203 cd/m², BT.2408), BT.2020 NCL YCbCr 4:4:4, 10-bit, with CICP nclx
(9/16/9, full range) and a clli box. ravif fixes the sRGB curve, so this
drives the rav1e + avif-serialize it already uses (no new crates).
Export: AVIF with `hdr` renders the HDR edit in Rec. 2020 and writes PQ.
Photos without an HDR edit export as before, in every format. CoreImage
decodes the file as HDR (same 3.1 % of the frame above SDR white as the gain
map JPEG of the same edit).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- Light panel: HDR switch, headroom limit and an SDR Rendition flyout
(shown with HDR on); Visualize HDR beside the switch.
- `Overlay::HdrRange` / `view.visualizeHdr`: the SDR render dimmed to grey,
with pixels the HDR rendition puts above SDR white painted in four bands by
stops above it. Rendered on the CPU from the float HDR render.
- Export dialog: "HDR output" for JPEG (gain map) and 32-bit TIFF.
- Parity (Q. HDR 2 ✅ 3 🟡, LR-EDIT-HDR-MODE ✅, LR-EXP-HDR 🟡), README, ROADMAP.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- `ExportOptions.hdr` (`hdr` param): photos edited in HDR export as ISO
21496-1 gain map JPEGs (the SDR rendition as the base, the gain map measured
against it as written) or 32-bit float TIFF with highlights above 1.
Other formats and SDR edits export as before.
- Output sharpening and watermarks apply to both renditions.
- `develop.hdr {enabled?, maxEv?}` turns HDR editing on/off and sets the
headroom limit.
Checked on macOS: ImageIO reports both the ISO and the Apple gain map, and
CoreImage's HDR decode of a 3 EV edit reaches 2.95 EV.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
`lightcraft_codecs::gainmap`:
- `compute` measures a gain map (luminance or RGB, log2, block-averaged)
from an SDR and an HDR rendition; `apply` rebuilds the HDR rendition.
- ISO 21496-1 metadata: writer (fixed denominator) and reader (also the
common-denominator form; refuses unknown versions, backward maps and zero
denominators). Adobe `hdrgm` XMP reader and writer, per-channel values as
rdf:Seq; Apple's HDRGainMap/HDRToneMap description of the same map.
- `encode_jpeg`: base with CIPA DC-007 MPF index (gain map typed 0x050000),
the ISO marker and Container XMP merged into the user's packet, followed by
the gain map JPEG. `read_jpeg` / `is_gain_map_jpeg` find and decode the map.
Also: gain map images are no longer picked as embedded thumbnails (an Ultra
HDR JPEG could show its greyscale gain map in the grid). The JPEG APP-segment
building is shared with `encode_jpeg`. Fuzzed with the other decoders.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- `DevelopSettings.hdr`: enabled, headroom limit (`max_ev`) and SDR-rendition
offsets (brightness, contrast, highlights, shadows, whites, clarity), with
control specs (`hdr.maxEv`, `hdr.sdr*`) and copied with the Light group.
- `ToneMap::hdr` / `display_hdr`: the SDR curve through the midtones, with
highlights lifted up to `2^max_ev`; identical to the SDR tables at peak 1.
- `OutputDepth::F32Hdr`: unclamped linear output up to the peak. The finish
stage carries the peak through highlight desaturation, gamut mapping,
encoding, curves, grain and LUT profiles; with HDR off every branch is the
SDR code path, bit for bit.
- `settings_for`: every non-HDR render (CPU and GPU) uses the SDR rendition.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Uncompressed 16-bit words are read in the other byte order only when the
file's order leaves more than 1% of sampled words at or above
1 << max(bits, 14) and the other order leaves none. Measured on the CC0
DSC-R1 (raw.pixls.us 3221). Crop and white balance (SR2SubIFD) are not
addressed. RENDER_CACHE_VERSION 31 (adjust at merge).
Single-strip ORFs at 12.8 bits per pixel are 16-byte blocks: ten little-endian
12-bit samples in bytes 0..14 plus a zero pad byte. Main routed them through the
XZ-2 12-bit word path (stripes, magenta cast). New branch before it; the exactly
12.0 bpp XZ-2 branch is unchanged. Layout measured on CC0 files (log and scripts in
data/testing/retry-olympus-e300 and tools/retry-olympus-e300).
RENDER_CACHE_VERSION bumped to 30 (open PRs use up to 29; adjust at merge).
- #540's crs::Target replaces the raw flag: #597/#604's folder sync and sidecar_op and #533's
process tests pass the photo's target instead of a bool.
- #568's DRO test fits through #528's fit_look (proxies now return the clipped mask).
- #541 (French) and #564 (Ukrainian) gain the 15 keyword format strings #578-#592 added.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The CLI snapshot test and the headless resize test sent Cmd+Plus to change egui's
interface scale; with the keys handed to View > Zoom they no longer did. A
ui.zoomFactor control request (0.5-3, documented) sets the scale explicitly.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A label added by another PR (Decrease Rating, Display Profile, …) no longer fails the
Ukrainian test; it shows in English until translated, as for the other languages.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Auto was a percentile rule that set Exposure about 1.4 EV higher than
Lightroom's Auto on the same photos (mean +1.81 against +0.44 EV) and
barely used Shadows: on 24 Sony raw photos its results were further from
Lightroom's Auto results (median dE76 22.0) than leaving the photo
unedited (7.9), about 18 L* too bright.
Auto is now Lightroom's shape of rule with values chosen for our results:
- Exposure = -0.58 - 0.41 * the scene's log-average luminance (EV from
middle grey, scene-linear, under the photo's white balance, so it does
not depend on the base tone curve), clamped to -2..3 EV. The slope is
Lightroom's: its Auto's chosen Exposure against our log average, r -0.92;
- Highlights -66 and Shadows +52: Lightroom's own average Auto values;
- Contrast +68 and Vibrance +30 (our scales; our base tone is flatter);
Whites, Blacks and Saturation 0.
The exposure offset, Contrast and Vibrance were fitted jointly so our
renders match Lightroom's Auto exports on the 16 photos whose starting
look Sony's DRO doesn't brighten (#568 changes the other 8). Held out one
photo at a time, each fold fitted from its own training photos only:
median dE76 6.38 on those 16 (8.28 unedited, 18.81 with the old rule),
12 of 16 closer than unedited; 7.70 on all 24 (7.92 unedited); on the 8
DRO photos 9.39 (7.00 unedited), their brighter start showing through.
Freeing Highlights and Shadows too (5 fitted values) did no better held
out (6.51) and left them poorly determined across folds.
The log average skips pixels that aren't finite (a damaged decode) through
the proxy's resampling and white balance; with no valid pixel, Exposure 0.
Values are black-box observations of Lightroom (the settings its Auto
chose and its exports), as in #514. Auto only applies when asked for, so
existing edits keep their look; HDR merges with Auto Settings use the
same rule.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
