# live-conformance/tonemap — exact tone mapping

The corpus of [`extensions/exact-tonemap.md`](../../extensions/exact-tonemap.md) §10:

- `vectors.json`:
  - `frames`: the five frames of the `int_video` clip as `wai.video.int_motion` decodes them,
    in `frames.rgb8` (each `RGB8`, 48 × 48, one after another), the content hash (`object`) of
    the envelope `video` that carries the clip with its ST 2094-50 companion, the clip's payload
    (`source`, below `wai/`) and the sidecar that publishes each frame's SHA-256 (`sidecar`);
  - `envelopes`: each envelope's `name`, its `file` and its `content_hash`
    ([jwp-receipts](../../extensions/jwp-receipts.md) §2.1);
  - `envelope_cases`: an envelope and the code SPEC §7.1's component rules give it (`role`;
    `null` where every component conforms);
  - `cases`: each its `records` in order as JSON texts, what the verifier `held` (the
    `envelopes`, by name; the `frames` file, or `""` for none), its `policy` (§8.1) and its
    `expect`ed outcome;
  - `arithmetic`: `L2` (`l2`, `[v, L2(v)]`), `E2` (`e2`, `[y, p, e]`), the table S (`srgb`),
    `tan` (`tan_q30`, `[θ, m]`) and the video's curves with their slopes (`slopes`), each at the
    points stated, and the SHA-256 of each over a whole range (`l2_sha256`: L2 at v = 1 + (k ·
    2654435761 mod 2^40) for k from 0 to 2^18 − 1; `e2_sha256`: E2's mantissa p for every
    fraction 0 to 65535; `tan_sha256`: tan for every angle 0 to 36000; each value as 8 bytes,
    little-endian, two's complement); large integers are written as decimal strings;
  - `measurement`: §6's figures, per derivation.
- `envelopes/*.wai`: the envelopes, `WAI2` but for `gainmap-as-wai1.wai`.
- `frames.rgb8`: the frames above.

**Tone-map equivalence.** For each case, a conforming verifier reaches the outcome it states:

- `refuse`: the `reason` of §9 and `at`, the record (`["record", i]`) or picture (`["record", i,
  "picture", j]`) refused;
- `accept`: the `statements` of §8.3, one per record, exactly as written.

A verifier that reaches another outcome, reason, place or statement does not conform.

**Provenance.** `wai_tonemap_vectors gen` writes every file here. The stills are generated: two
HDR scenes written as integer formulas in the generator (a sky with a sun six times reference
white and coloured patches, one past white; a dim room with a window and a lamp), rendered to an
sRGB base and a gain map by the reference's own encoder, integer throughout. The video is the
`int_video` clip of `wai-rs/tests/vectors/int_video/`, generated there (a disc over a gradient).
Every key is SHA-256 of the corpus's label and an index, every time is a constant, and Ed25519
signing is deterministic, so every file is the same bytes on every machine.

```
python3 -I ../tonemap_verify.py .
```