The decoder tried each high-frequency band at its synthesis width and up to
two more columns, keeping the first width whose entropy stream ended exactly.
Two widths can both do that with different coefficients (#899).
Measured on every C-RAW plane in cr3_corpus.rs (CC0 raw.pixls.us files):
each band decodes at exactly one width. A tile with a neighbour on its right
codes bands 5 and 8 (the vertical high-pass of the level-2 and level-1
low-pass columns) at an odd width, so an even band gains one unused column;
no other band is extended. The width now comes from that rule, and a stream
that does not fit it is corrupt (the CR3 falls back to its preview).
All corpus sensor hashes are unchanged. The property-test encoder now codes
bands 5 and 8 the same way. Middle tiles (three or more C-RAW tiles) follow
the left-tile rule; no public file has one.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- Visualize HDR (#1555) has no default key: ⇧H cycles the Tool Overlay (#1473, issue #224)
- CR3 tests (#1461, #1462) accept adaptive QP 131–175, as #1694 decodes; cr3.md says the R6 Mark II files decode
- English fallbacks in the Czech and Polish catalogs use → for the menu triangle; Polish in the keyword-label test
- canvas handle tests show pins (Tool Overlay Always); a focused handle keeps its pins shown in Auto
- the model-install test and demo deadlock guards wait on deadlines long enough for a busy machine
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Keeps upstream's ColorData 66 handling (white level from the data); recounts
coverage (259 verified, 919 unverified, 232 preview); drops the duplicate
raw-parity rows; notes high-QP R6 Mark II C-RAW and unverified R7 C-RAW.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
docs/cr3.md gains a variant-status table: every supported and rejected CRX
coding variant, the function that gates it and the exact Unsupported text.
crates/raw/tests/cr3_variants.rs enforces the rejections (19 tests). Each
rejected variant is rebuilt as a small synthetic CR3 (container, CMP1
descriptor, CRX stream) and the test asserts the exact string, and that
probe_info (the import path) and decode return the same error. Control
fixtures decode through the same container, including both edges of the
accepted uniform quantization range (4..=44) and adaptive QP range
(131..=168), so a rejection can only come from the documented gate. The
table itself is prose and is not checked against the tests.
The doc said only QP values 131-167 were accepted; the decoder also accepts
168 (quantization value 44, step 102), so that sentence now says so.
Tests and docs only; no decoder change.
Four CC0 EOS RP samples from raw.pixls.us (lossless RAW and C-RAW, full
frame and 1.6x crop mode) now have exact full-sensor regressions against
the DNGLab 0.8.0 black-box oracle (Windows binary, checked first against
the documented M50 RAW hash). The decoder already matched; no decoder
change was needed. Crop mode is a single 4032x2656 tile, full frame two
3192-wide tiles.
docs/cr3.md also records that the white level is Canon's specular white,
which at the -1/3-stop ISOs (e.g. 11062 at ISO 5000) is well below the
sensor's saturation point.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Version 66 keeps version 64's as-shot white balance and black level
offsets; its word 661 is below where the sensor clips, so the white
level stays measured from the data. Checked on 33 R6 Mark III files
from 12 shoots: all now open with their as-shot white balance, black
levels match the masked columns.
Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017JKdR4oZ3jRSPPwMLLTa2U
All 110 CC0 CR3s on raw.pixls.us decode from sensor data; none uses a
refused CRX variant. One CC0 file per further body (1D X III, 90D, 250D,
850D, M200, M50 II, M6 II, R, R3, R5, R6, R6 II, R6 III, R7, R10, RP, R50,
R50 V, G5 X II, G7 X III, SX70, V1) is added to RAW_SAMPLES and pinned in
cr3_corpus.rs, checked against the camera's embedded JPEG.
The R6 Mark III writes ColorData version 66, laid out as 64/65; it lost
its as-shot WB and white level. Render cache 61 -> 62.
Also: as_chunks in spots.rs for the chunks_exact_to_as_chunks lint.
Docs: evidence.tsv + coverage re-measure (257 verified, 92% use-weighted),
gaps 2/10, checklist rows, raw-parity, target-app-parity, ROADMAP, README.
Sources: own black-box analysis of CC0 files; ExifTool Canon tag tables.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
The CRX 0x200 QP map opens with its first symbol as a 32-bit literal; every
later symbol is Rice coded with a limited-length escape: 23 zeros, the
terminating 1 and the symbol in 8 bits (the ITU-T T.87 layout for a 32-bit
limit and 8-bit symbols, without its minus-one offset). The old rule (an
escape after 16 zeros with a 16-bit literal) matched only the first symbol,
which is all the R8 and R7 maps need. R5 Mark II maps (QP 150-162) jump by up
to 12 where the Rice parameter is 0, giving 18- to 22-zero prefixes that
misparsed ("Canon CRX adaptive QP value -21087"): 174 of 306 sampled files
from a private R5 Mark II library opened as previews. Every QP map of its
33,665 C-RAW files now decodes to the exact end of its entropy stream; the six
oracle fixtures are unchanged. Established by black-box analysis of the
bitstream; no third-party decoder source consulted.
Adds the four CC0 R5 Mark II samples (raw.pixls.us 7881-7884) to the corpus
with pinned sensor hashes (the crop-mode framing is left to #754), bumps
RENDER_CACHE_VERSION to 43, and updates cr3.md, raw-parity (235 verified
models), coverage, gaps, the checklist rows, ROADMAP, target-app-parity and
What's New.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Canon EOS R50 C-RAW files reach QP 168 (quant 44, step 102, measured about 100). The quantization step and the adaptive QP map range accept it; anything above stays rejected. Bumps RENDER_CACHE_VERSION since such files change from the embedded preview to a raw decode.
The R5 Mark II's APS-C crop-mode files (5376 x 3574) state an IAD1 active area of x 132..5243,
but columns 132..~256 sit at the black level and the image runs to the right edge (measured on
raw.pixls.us 7883/7884), while their recommended crop, x 272..5359 (5088 x 3392, the camera JPEG's
size), lies on the image. The recommended crop didn't fit inside the stated active area, so the
whole active area was kept: a black band down the left and ~130 image columns lost.
When the recommended crop doesn't fit inside the stated active area, it is now the valid area.
On 7883 the render's high-pass correlation with the camera JPEG goes from -0.13 to 0.99. The
active area and crop of the other 108 decodable CC0 CR3s on raw.pixls.us are unchanged.
RENDER_CACHE_VERSION 49.
An odd-height adaptive QP map (EOS R7: 4732 sensor rows, 1183 QP rows)
was rejected as unsupported, so R7 C-RAW files opened from their embedded
JPEG. The map decodes to the exact end of its entropy stream; the last
row of the second-level high-frequency bands has no partner row and its
QP is used alone. Even-height maps never reach this rule, so the six
verified M50/R100/R8 fixtures are unchanged.
Checked on paired R7 RAW and C-RAW captures (ISO 100 and 6400): all
six C-RAW files decode, developed images match their RAW counterparts
visually, and ISO 6400 sensor means agree within 0.1%.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Gs6roPby7THvteijZwptQt
The Canon maker note's AspectInfo (tag 0x009a: aspect code, cropped width,
height, left, top) holds the rectangle of the shot, measured from the
recommended image crop. Use it as the CR3 default crop, so 3:2, 4:3, 16:9 and
1:1 shots develop in the shape the photographer chose. The tag is ignored when
it is missing, does not fit, or the recommended crop itself is inconsistent.
RENDER_CACHE_VERSION 15 -> 16. The M50 C-RAW corpus sample (raw.pixls.us 2663)
was shot at 1:1 and now develops at 4000 x 4000.
C-RAW is quantised wavelet coding: next to clipped highlights its
reconstruction overshoots the sensor range by a few quantisation steps.
On 17 CC0 CR3 files (SX70 HS, G5 X Mark II, M6 Mark II, EOS R, RP, 90D,
M200, R5 Mark II, R6 Mark II, R6 Mark III, R8) samples reached 16384 to
16419 at 14 bits, never below 0, and decoding failed with "decoded
sample outside its bit depth". Lossless files of the same bodies clip at
exactly 16383. Wavelet samples are now clamped to the CMP1 bit depth;
lossless samples outside it are still corrupt data.
The other 93 CR3 files have no sample outside the range and render
pixel-identically. Render cache version 13 -> 14.
Decode lossless CRX and version 0x100/0x200 C-RAW in portable Rust,
including sensor geometry, timed white balance and black/white levels.
Verify all sensor samples against six independent M50/R100/R8 references.
Any CR3 decode error falls back to the embedded JPEG, as CR3 files did
before this decoder. The full sensor buffer is allocated only after the
first plane decodes, and plane buffers grow row by row. Tile planes
decode in parallel with a windowed bit reader (24 MP: 424 -> 89 ms
lossless, 519 -> 138 ms C-RAW on an M4).
Add guarded CR3 camera-JPEG colour fitting with independent framing
validation, relative white balance and cache invalidation.
Validation: cargo xtask ci.
