Allow TIFF compression schemes for 32F#28785
Related to [https://github.com/opencv/opencv/issues/28775](https://github.com/opencv/opencv/issues/28775)
Previously, only 32FC3+SGILOG could be specified for TIFF encoding. But when floats use quantization, compression schemes can be efficient even on 32F data. This PR will allow them.
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I just don't know what kind of accuracy/performance tests should be added.
imgcodecs(webp): improve IMWRITE_WEBP_LOSSLESS_MODE to support exact lossless compression #28519Close#28503
Add IMWRITE_WEBP_LOSSLESS_MODE enum to control lossless strategy:
- IMWRITE_WEBP_LOSSLESS_OFF: Lossy compression.
- IMWRITE_WEBP_LOSSLESS_ON: Optimize/drop color in transparent pixels.
- IMWRITE_WEBP_LOSSLESS_PRESERVE_COLOR: Preserve color in transparent pixels.
Note: Currently limited to still images; animated WebP support is deferred per YAGNI.
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imgcodecs: Fix IMWRITE_AVIF_DEPTH typo and update AVIF details on imwrite() #28063
Close https://github.com/opencv/opencv/issues/28062
- Corrected the documentation for `IMWRITE_AVIF_DEPTH`.
- Added descriptions for the new AVIF encoder parameters in `imwrite()` documentation.
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Add strict validation for encoding parameters for APNG, Animation WebP #27769
Extra fix for https://github.com/opencv/opencv/issues/27557
- Fix for build errors with libspng library.
- Add strict validation for APNG.
- Add strict validation for Animation WebP.
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imgcodecs: bmp: support to write 32bpp BMP with BI_BITFIELDS #27559
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doc: fix doxygen warnings for imgcodecs, flann and objdetect #27730
Close https://github.com/opencv/opencv/issues/27729
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libpng upgrade to 1.6.45 and cICP metadata support for PNG imwrite #27741
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resolves#24185
libpng docs: https://www.w3.org/TR/png-3/#cICP-chunk
similar code from ffmpeg: https://github.com/FFmpeg/FFmpeg/blob/a700f0f72d1f073e5adcfbb16f4633850b0ef51c/libavcodec/pngenc.c#L452-L456
So issue #24185 can be solved by replacing `cv.imwrite` in user's code to `cv.imwriteWithMetadata`:
```python
cv.imwriteWithMetadata("frame.png", frame, [cv.IMAGE_METADATA_CICP], np.array([[9, 18, 0, 1]], np.uint8))
```
```
$ exiftool /home/d.kurtaev/opencv_build/frames_pr/image_38.png
ExifTool Version Number : 12.76
File Name : image_38.png
Directory : /home/d.kurtaev/opencv_build/frames_pr
File Size : 3.8 MB
File Modification Date/Time : 2025:09:02 20:48:22+03:00
File Access Date/Time : 2025:09:02 20:48:22+03:00
File Inode Change Date/Time : 2025:09:02 20:48:22+03:00
File Permissions : -rw-r--r--
File Type : PNG
File Type Extension : png
MIME Type : image/png
Image Width : 1080
Image Height : 1920
Bit Depth : 8
Color Type : RGB
Compression : Deflate/Inflate
Filter : Adaptive
Interlace : Noninterlaced
Color Primaries : BT.2020, BT.2100
Transfer Characteristics : BT.2100 HLG, ARIB STD-B67
Matrix Coefficients : Identity matrix
Video Full Range Flag : 1
Image Size : 1080x1920
Megapixels : 2.1
```
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Add strict validation for encoding parameters #27621
Close https://github.com/opencv/opencv/issues/27557
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[GSOC 2025] PNG&WebP Metadata Reading Writing Improvements #27503
Merge with https://github.com/opencv/opencv_extra/pull/1271
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Add enum IMWRITE_PNG_ZLIBBUFFER_SIZE #27551
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This patch enables users to set the internal zlib compression buffer size for PNG encoding
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imgcodecs: OpenEXR multispectral read/write support #27485
OpenCV Extra: https://github.com/opencv/opencv_extra/pull/1262/
Adds capability to read and write multispectral (>4 channels) images in OpenEXR format.
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Extend image I/O API with metadata support #27499
Covered with the PR:
* AVIF encoder can write exif, xmp, icc
* AVIF decoder can read exif
* JPEG encoder can write exif
* JPEG decoder can read exif
* PNG encoder can write exif
* PNG decoder can read exif
This PR is a sort of preamble for #27488. I suggest to merge this one first to OpenCV 4.x, then promote this change to OpenCV 5.x and then provide extra API to read and write metadata in 5.x (or maybe 4.x) in a style similar to #27488. Maybe in that PR exif packing/unpacking should be done using a separate external API. That is, metadata reading and writing can/should be done in 2 steps:
* [1] pack and then [2] embed exif into image at the encoding stage.
* [1] extract and then [2] unpack exif at the decoding stage.
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Changes about when APNG has a hidden frame #27127
closes : #27074
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imgcodecs: gif: support animated gif without loop #26971Close#26970
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Test for in-memory animation encoding and decoding #27013
Tests for https://github.com/opencv/opencv/pull/26964
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APNG encoding optimization #26849
related #26840
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imgcodecs:gif: support IMREAD_UNCHANGED and IMREAD_GRAYSCALE #26859Close#26858
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Fix oss-fuzz bugs 391934081 and 392318892 #26854
- fix a potential overflow in x0+w0
- use the proper function to deal with background color to deal with all cases of the spec
- use BGR layout for APNG background color
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Added CV_WRAP to Animation struct #26813closes#26808
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Animated WebP Support #25608
related issues #24855#22569
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[GSoC] Add GIF decode and encode for imgcodecs #25691
this is related to #24855
we add gif support for `imread`, `imreadmulti`, `imwrite` and `imwritemulti`
opencv_extra: https://github.com/opencv/opencv_extra/pull/1203
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Support CV_32U, CV_64U and CV_64S for TIFF #26508
Close https://github.com/opencv/opencv/issues/26507
Note: Predictor 2 for 64-bit is only supported after libtiff 4.4.0. But Linux x64 Debug uses libtiff 4.1.0 (releases at 2019/11/3). I append fallback fix to NONE. I hope It works well.
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imgcodecs: implement imencodemulti() #26211Close#26207
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Documentation update for imagecodecs #26152
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Alexander Smorkalov
Pierre Chatelier
Kumataro
Parth Parekh
Dmitry Kurtaev
Suleyman TURKMEN
xaos-cz
Vadim Pisarevsky
Alexander Smorkalov
Vincent Rabaud
cDc
Super
Maksim Shabunin
Sourav Kumar