dtourolleandClaude Opus 5
5226f7223b
A burst is the commonest thing in a cull and the least interesting: twelve frames of the same gull at 10 fps occupy twelve cells, are scrolled past twelve times, and end with the photographer keeping one. FR-CULL-5 asks for them to collapse to one representative and be judged as a unit. Two signals, because neither alone survives a real library. Time alone groups a whole wedding ceremony -- a photographer working steadily never leaves the gap that would end the run. Similarity alone groups a studio setup shot across two days, which is a project rather than a moment. Together they are specific: adjacent in time *and* looks like the frame before it. Two seconds is the time bound, and the reason is worth recording because the figure looks absurd next to a 10 fps camera. `images.captured_at` is whole seconds -- EXIF's DateTimeOriginal has no sub-second field and SubSecTimeOriginal is optional and widely omitted -- so a burst arrives in the catalog as ten frames sharing one timestamp. Any threshold finer than a second is a threshold on information that is not there. Where the pace really is faster, the similarity bound is what separates the frames. Similarity is a 64-bit difference hash over a 9x8 box-averaged reduction, compared between *adjacent* frames only. Chained rather than anchored on the first frame, because by frame twenty a camera following a bird has nothing in common with frame one while no two neighbours differ by much; the time bound is what stops the chain running away. There is no all-pairs step and there must never be one -- that is what turns a grouping pass into something nobody can afford to run over 50k images. Nothing here ranks a frame. FR-CULL-5 names the failure it is avoiding, which is rejecting the only frame of an important moment because somebody blinked, so there is no sharpness score and no best-of-burst. The representative is the earliest frame -- a fact about the clock, not a judgement about the photograph -- and the user's own choice lives in its own table so that rebuilding the grouping cannot erase it. Same argument `people.ignored` makes one subsystem over: nothing short of remembering a decision survives re-clustering. A newly found burst is recorded *open*. Collapsing on discovery would be tidier, and would also mean a background pass taking photographs off the screen part way through a cull. The pass marks; the user folds. It is a pass rather than a job kind for the reason catalog.md 10.2 gives for face clustering: a burst is a property of a run of frames and has no natural subject_id, so a per-image job would rebuild the world once per photograph. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
DarkRoom
A cross-platform, non-destructive RAW photo editor for Linux and Android.
Status: 0.9.0, and no longer a spike. A library opens, culls, develops and exports on both platforms, across eight tagged releases. What is not built is written down rather than merely absent — see docs/outstanding.md for the requirements that have no implementation and why, and docs/technical-debt.md for the compromises that were chosen.
Documentation
| Document | Contents |
|---|---|
| CONTRIBUTING.md | How to land a first change without reading the rest |
| requirements.md | What the software must do — 179 numbered requirements |
| architecture.md | How it is built — crates, GPU pipeline, data model, sync |
| technical-debt.md | Compromises taken deliberately, each with the condition that retires it |
| outstanding.md | What is not built, and whether that is a decision or a gap |
| code-health.md | What a contribution costs, per seam, measured |
| traceability.md | Generated: which requirement is claimed by which file |
| faces.md | Face detection and identity — the models, the licence problem, and what S14 measured |
Building
Desktop:
cargo run -p darkroom-desktop
Android (containerised toolchain, see docker/android):
./docker/android/build.sh cargo ndk -t arm64-v8a build --release
Git LFS is required for the model weights, and the toolchain pins itself. CONTRIBUTING.md has the details and the four commands CI will run against what you send.
Current state
Working. A catalog over a local folder, a Nextcloud account, or a folder a
sync client keeps in virtual-files mode — where a placeholder is treated as the
photograph rather than as a one-byte file. A virtualised library grid with a
capture-time timeline, ratings, labels, keywords, collections and a trash that
survives a crash mid-operation. Card ingest. Face detection and identity, with
the index syncing between devices. A develop pipeline of fifteen declared
operations fused into a single compute dispatch, plus the neighbourhood
operations that cannot be — clarity, texture, capture sharpening, noise
reduction, lens correction, spectral film simulation. Crop, straighten, spot
removal, gradient and subject-segmentation masks, named presets, and a
generated panel that no operation in ui/ is allowed to name. Export to JPEG,
PNG and 8- or 16-bit TIFF with resize and output sharpening.
The zero-copy display path works on desktop. The compute pass writes a texture that Slint composites directly, which is what ARCH §6.1 requires; the readback it forbids costs 96% of frame time at 4K, and
cargo run -p dr-gpu --example bench --features readback
still reproduces that measurement. The one exception is the Android develop view, which reads the frame back through the CPU because zero-copy there needs wgpu's Vulkan swapchain, and that tears a portrait window on a tablet whose panel is mounted landscape. It is debt, not a revision of the rule: the reasoning, the on-device measurements that forced it, and the three separate things any one of which would remove it are in technical-debt.md TD-1.
Not built. Plugins, compare and survey culling, focus peaking, burst grouping, AI denoise, tiled and progressive rendering, and most of the Android platform integration beyond running. The performance targets in §4.1 are unverified rather than unmet — the per-commit benchmark suite §8 requires does not exist, so nothing fails a build on a regression. docs/outstanding.md is the list, with the reasoning.
Licence
GPL-3.0-or-later.