Fix alpha handling for blending in PNG format #27981
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closes#27974
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libtiff upgrade to version 4.7.0 #27679
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Performance tests for writing and reading animations #27605
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related : https://github.com/opencv/opencv/pull/27496
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Jpeg Metadata (iccp and xmp) #27583
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to do :
- [x] consider `m_read_options`
- [x] check if ICCP metadata is suitable to write PNG
- [x] the file `testExifOrientation_3.jpg` used in the test has an ICCP data. this data can be saved in jpg format but could not in PNG and WEBP format. Impovements to check this case with PNGEncoder and WEBPEncoder planned.
[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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Fix for 2 channel PNGs #27469closes#26825
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Fixing imread() function 16 bit reading png problem with libspng #27113
The purpose of the PR was to load bit-exact compatible results with libspng and libpng. To test this, `Imgcodecs_Png_PngSuite `was improved. Files containing gamma correction were moved to a separate test called `Imgcodecs_Png_PngSuite_Gamma `because the logic created for the other files did not apply to those with gamma correction. As a result, libspng now works in bit-exact compatibility with libpng. The code can be refactored later.
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Changes about when APNG has a hidden frame #27127
closes : #27074
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fix for the issue #27456#27457closes#27456
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Update tutorials #26441
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APNG encoding optimization #26849
related #26840
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Add a test related IMWRITE_PNG_COMPRESSION parameter #26973
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Performance tests for image encoders and decoders and code cleanup #26872
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Fixed AVIF linkage on Windows #26762Closes#26747
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Corrections on bKGD chunk writing and reading in PNG #26835
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Added CV_WRAP to Animation struct #26813closes#26808
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Fix for png durations and memory leak #26714
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Animated PNG Support #25715
Continues https://github.com/opencv/opencv/pull/25608
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Animated WebP Support #25608
related issues #24855#22569
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Proposed solution for the issue 26297 #26298closes#26297
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Update Documentation #26260
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Documentation update for imagecodecs #26152
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Update test_tiff.cpp #26093
related #22090
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3rdparty: update libpng 1.6.43 #25580
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Suleyman TURKMEN
