`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>
Sensor-clipped pixels are rebuilt at raw decode. The tone map rolls them off to
white at Neutral, so any colour they carry shows only when Highlights, a negative
Exposure or Whites darkens them. They took colour from the nearest unclipped pixel
(dark foliage, lens fringes along branches, pixels demosaiced from clipped samples),
left two clipped channels at their white-balance-scaled clip levels (red or pink),
and were neutral only in camera RGB, not after the colour model (a look fitted to
the camera's JPEG, a camera profile).
- highlight::reconstruct_with: chromaticity only from bright unclipped content away
from edges and from the clip, through a normalised push-pull pyramid; a neutral
estimate blended in where reliable content is scarce at every scale up to a
quarter of the long edge, applied only as far as the pixel lies past the nearest
near-clip unclipped pixels (so a surface still runs into clipping without a
step); clipped pairs keep the estimate's ratio at their clip floors; partly
clipped pixels fade into the clipped neutral on their way from the first channel
clipping to the last; fully clipped pixels become the colour model's neutral.
Pixels without a clipped channel are left exactly as they were.
- engine: the decode colour step as CameraColourModel, with clipped_white, which
keeps the camera's neutral for nearly singular or implausible models.
- Tests in raw (continuity along a ramp through every clip, also as lines 1 to 16
rows thick with no reliable colour, on canvases 32 to 1024 rows), engine
(pipeline renders at Highlights -100, #523's edit and Exposure -2 through the
first clip, over the same sweep; a CC0 ILCE-7RM4 corpus file added to
RAW_SAMPLES) and the GPU equivalence suite.
- Render cache version 27.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Part of #535 (item 4).
Pre-2017 bodies without Sony crop tags shot in the camera's 16:9 mode now get
the 16:9 crop of their camera JPEG: width from FullImageSize, anchored left as
before (drops the ILCE-7SM2's 32 padding columns); height from FullImageSize
(ILCE-7SM2) or from an Exif image size of the same width (DSLR-A580, whose
FullImageSize still says 3:2); centred vertically at an even offset, as measured
by registering each camera JPEG on its raw. The aspect now matches the JPEG, so
the camera-look fit runs: ILCE-7SM2 dE 15.2 -> 4.8, DSLR-A580 dE 26.7 -> 3.9.
Only these 2 of 140 Sony decodes change; render cache version 26 (23-25 are
taken by #568, #542, #575).
Tests: crop helper (3:2 unchanged, both 16:9 sources, even offsets, hostile
sizes) and a corpus test of the two crops against their camera JPEGs; both
samples added to the corpus list.
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>
