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44 Commits
Author SHA1 Message Date
Lilith River 43cfc5bc3a test: self-verifying seq images with CRC32 hash in filenames 
Move 74 seq-*.tiff test images to tests/images/seq/ and embed a CRC32
hash of the full decoded output (dimensions, color type, sample data)
as the last filename segment. Replace 75 individual test functions with
one generic verify_all_seq_images test that decodes each file and
validates its hash against the filename.

This catches byte-order, bit-alignment, stride, padding, and value
errors that sum-based tests would miss (e.g., swapped pixels preserve
the sum but change the hash). Adding new test images only requires
dropping a correctly-named file in seq/ — no test code changes needed.
 2026-03-10 06:02:19 -06:00
Lilith River c3977c4513 test: expand test suite to 74 images with libtiff reference decoder 
Add 19 new libtiff-generated test images and a reference decoder
(verify_seq_tiff.c) that independently verifies all checksums using
libtiff's own read path, giving three-way agreement:
  libtiff writer → libtiff reader → image-tiff reader

New coverage:
- Standard sub-byte: 1-bit, 2-bit, 4-bit grayscale (BIZ + WIZ)
- Multi-strip: RowsPerStrip=4 (gray 8/16, RGB 8)
- Tiled + compressed: LZW and Deflate tiles
- Float predictor: f32/f64 + Deflate + predictor=3
- Unassociated alpha: RGBA 8-bit with EXTRASAMPLE_UNASSALPHA
- Sub-byte RGB: 5-bit and 7-bit contiguous
- Signed RGB: i8 and i16 (3-channel, decoded as Multiband)
- Float f64 RGB
- Tiled BigTIFF

verify_seq_tiff.c: reads each TIFF with libtiff, computes matching
checksums (handling packed sub-byte, unpacked extended, float, signed),
and verifies 68/68 cases pass.

Total: 74 test images (66.8 KB), 317 tests all passing.
 2026-03-10 06:02:19 -06:00
Lilith River a4cbf7bbaf test: add 28 format-variant test images covering compression, tiled, BigTIFF, float, signed, CMYK, palette, RGBA, multi-page, and big-endian 
Expand gen_seq_tiff.c with writers for standard-depth formats that exercise
different decoder code paths. All 55 seq-* images are 16x16, libtiff-generated,
and cross-validated against tifffile.

New coverage:
- Compression: LZW, Deflate, PackBits (gray 8/16-bit, RGB 8-bit)
- LZW + horizontal predictor (8-bit gray)
- Tiled layout: gray 8/16-bit, RGB 8-bit (16x16 tiles)
- BigTIFF: gray 8-bit, RGB 16-bit
- Float: gray f32/f64, RGB f32
- Signed integer: i8, i16, i32
- CMYK: 8-bit, 16-bit
- Palette/indexed: 4-bit, 8-bit (with known colormap)
- RGBA with associated alpha: 8-bit, 16-bit
- Multi-page: 3-page gray 8-bit (all pages verified)
- Big-endian byte order: gray 8/16-bit, RGB 8-bit

Total: 298 tests, all passing.
 2026-03-10 06:02:19 -06:00
Lilith River 26c32431fa test: regenerate seq-* test images using libtiff C API 
Replace Python-generated test TIFFs with libtiff-generated ones to
eliminate circular validation. The C program (gen_seq_tiff.c) uses
libtiff's TIFFWriteScanline with MSB-first packed bit streams.

Cross-validated: tifffile independently confirms all 27 images match
the original Python-generated versions byte-for-byte. tiffinfo validates
all IFD structures. All 27 image-tiff decode tests pass unchanged.
 2026-03-10 06:02:19 -06:00
Lilith River 5090003bda test: add 27 sequential-value test images for bit-error detection 
Generated by gen_seq_images.py using manual TIFF writer with packed
bit streams matching TIFF spec. Each 16x16 image has cycling 0..max
values so any bit-level decode error changes the checksum.

Test matrix:
- Sub-byte BlackIsZero: 3/5/7-bit
- Sub-byte WhiteIsZero: 3/5/6/7-bit
- Extended BlackIsZero: 10/12/14/24-bit
- Extended WhiteIsZero: 10/12/14/24-bit
- Extended HPredict: 10/12/14/24-bit
- RGB contiguous: 10/12/14/24-bit
- RGB planar: 10/12/14/24-bit (first plane only via read_image)
 2026-03-10 06:02:19 -06:00
Lilith River fb1afc81e9 fix: handle WhiteIsZero for non-standard sub-byte depths (3/5/6/7-bit) 
For sub-byte depths where samples cross byte boundaries (3, 5, 6, 7-bit),
byte-wise NOT corrupts samples. Added per-sample inversion that extracts
each N-bit sample from the packed stream, computes (max - value), and
writes it back.

Tests cover:
- 3/5/7-bit BlackIsZero (verify basic decoding)
- 3-bit and 6-bit WhiteIsZero (verify per-sample inversion)
 2026-03-10 06:02:19 -06:00
Lilith River 29e43d2314 fix: handle WhiteIsZero for extended bit depths, add comprehensive tests 
Fix invert_colors to support extended bit depths (9-15 promoted to u16,
17-31 promoted to u32). Byte-wise NOT doesn't work for promoted samples
because it flips unused upper bits; use (max - value) instead.

Add regression tests covering the extended depth matrix:
- Gray 10/14/24-bit (contiguous, BlackIsZero)
- RGB 10/14/24-bit (contiguous)
- RGB 10/12/14/24-bit (planar)
- Gray 12-bit with WhiteIsZero (synthetic 4x2 image)
- Gray 12-bit with horizontal predictor (synthetic 4x2 image)
 2026-03-10 06:02:19 -06:00
Maria Pospelova c304a3cc13 Upgrade Group4Reader dimensions from u16 to u32 2026-03-03 10:50:27 +00:00
Jonathan BehrensandA. Molzer a0191ed1a7 Support decoding WebP compressed TIFFs (#336) 
Co-authored-by: A. Molzer <5550310+197g@users.noreply.github.com>
 2026-01-29 10:53:00 -08:00
A. Molzer 2eef9ac088 Encoding of extra samples, roundtrip test 2025-11-12 01:41:38 +01:00
A. Molzer 8517bb81db Decode with ExtraSamples 
These samples are normal bits in the encoded (e.g. compressed) stream of
each tile or row of the image. However, when considering the photometric
interpretation of an image these samples should be discarded. They are
only relevant for multiband.

For the most part we previously rejected these images due to a mismatch
between sample count and the color as indicated by the interpretation.
Only, for alpha we never really verified if the extra channel is indeed
alpha or something unrelated. We don't have a perfect solution as
GeoTiff motivates us having a MultiBand pseudo-color output
configuration that has no related photometric interpretation and borrows
the usual gray tone instead. We can only really distinguish this from a
gray-alpha image through looking at the values of the ExtraSamples
vector. Then again we do not yet support GrayAlpha anyways.

As a simplification for the discarding process we only support full-byte
extra samples and require all samples to be the same bit-depth, not only
those which we return. This is blessed by Tiff's recommendations for
baseline decoding as well as libtiff.
 2025-11-12 01:23:12 +01:00
Aurelia Molzer bc71086a96 Verify WhiteIsZero invert, add Gray(1) color type 
This was found through the fax4 decoding that is always bilevel.

No longer silently ignore an unknown color type when a photometric
interpretation requires an inversion. DICOM requires that WhiteIsZero
and BlackIsZero are only used for samples-per-pixel=1 but we do not
strictly enforce that early. Previously for the result Multiband color
we just ignored the tag which is also not right.
 2025-09-01 00:25:48 +02:00
Stephen Judkins 666f871d30 CCITT group 4 (Fax4) decoding support 2025-08-30 23:20:41 +02:00
Emma 29b71ff597 add CMYKA (#208) 2025-06-15 16:38:22 -07:00
Micah Chambers 3bfb43e83e Add FP16 support (#257) 2025-02-04 19:12:01 -08:00
Stefan Schake a19cf37587 Support ZSTD compression method for reading (#256) 2024-12-20 12:50:34 -08:00
Jonathan Behrens 96d3a02efe Fix 1bpp image decoding and add a test image (#252) 2024-10-31 20:21:02 -07:00
Wei Ji 307cd8be97 Add SignedByte and SignedShort enum variants (#234) 2024-07-21 20:37:25 -07:00
Wei Jiandtromper 0c54a18e21 Add ColorType::Multiband enum variant to support samples>1 per pixel (#224) 
Co-authored-by: tromper <scott@hopkinsunderground.com>
 2024-03-24 15:04:52 -07:00
Pirmin Kalberer 42feeba8da Add basic support for planar configuration 2023-01-12 23:34:31 +01:00
Kurt Kühnert da07c0f4f5 added round trip test 
fixed ci
added colortype
 2023-01-05 09:34:54 +01:00
Jonathan Behrens 8e5c5b44c5 Support floating point predictor (predictor 3) 
Based on work by @TomasKralCZ in #135
 2022-06-22 20:14:25 -07:00
Tomáš Král e92cf219a9 Fix the mandrill.tiff regression (#145) 
* fix mandrill.tiff regression from upstream

* use contains_key(), added StripTileTagConflict error

* updated test_div_zero, added test_no_rows_per_strip
 2021-06-17 09:22:07 -04:00
Tomáš Král b9590e0842 remove WhiteIsZero i8 test 2021-05-15 18:15:24 +02:00
Tomáš Král 00e0eb9006 incremental tile decoding, refactoring 2021-04-12 15:09:39 +02:00
Tomáš Král fddc048849 changed test photos to avoid coyright, added whiteiszero test 2021-04-06 13:58:33 +02:00
Tomáš Král b2a7e35c85 added basic tiled-based decoding 2021-04-04 18:15:28 +02:00
HagaiHargil cd2f4f6462 Added tests and finalized i8 support 2020-12-13 12:00:48 +02:00
HagaiHargil 7ec2b75c70 Added int16 tests 2020-12-08 13:42:08 +02:00
Andreas Molzer 44c75a66ab Merge remote-tracking branch 'origin/master' into features/32-bit-float-samples 2020-08-31 20:50:16 +02:00
Etienne Prothon 5f48444fa0 Merge branch 'master' of github.com:Farkal/image-tiff into features/32-bit-float-samples 2020-08-04 16:43:01 +02:00
Etienne Prothon 797e3dca07 fix: Big tiff decoding and add tests 2020-07-24 00:47:14 +02:00
Andrew Champion c2084835fa Add support for IEEEFP Gray/RGB/RGBA/CMYK(64) decoding 2020-02-10 13:21:16 +00:00
Andrew Champion 97c888f166 Add support for IEEEFP RGB/RGBA/CMYK(32) decoding 2020-02-10 13:21:13 +00:00
Andrew Champion 24d347ecf5 Tests: add regression test for issue 69 2020-02-09 18:37:16 +00:00
Andrew Champion bbc49291e4 Add support for IEEEFP Gray(32) decoding 2020-02-06 18:40:41 +00:00
Andrew Champion 462697e373 Add support for CMYK(16|32|64) decoding 2019-12-21 15:57:24 +00:00
Andrew Champion c537f5cc64 Add decode test for CMYK(8) 2019-12-21 15:57:24 +00:00
Andrew Champion c72a8d364d Add tests for exotic 12-bit sample images 
These images should correctly report their color depths, but fail to
decode as they are unsupported.
 2019-12-16 18:53:44 +00:00
Andrew Champion 0c53e1066a Support 64-bit rgb and rgba decoding 2019-12-10 20:18:53 +00:00
Andrew Champion f4e985e0bd Support 64-bit grayscale decoding 2019-12-10 20:18:53 +00:00
Andrew Champion 1f92c562bc Support 32-bit rgb and rgba decoding 2019-12-10 20:18:51 +00:00
Andrew Champion fca4e1f88a Support 32-bit grayscale decoding 2019-12-10 20:18:23 +00:00
R.Chavignat ec72f33dbc Add some integration tests 
The included images are taken from the libtiff test suite.
 2018-06-17 16:19:39 +02:00