This folder contains libraries and headers of a few very popular still image codecs
used by imgcodecs module.
The libraries and headers are preferably to build Win32 and Win64 versions of OpenCV.
On UNIX systems all the libraries are automatically detected by configure script.
In order to use these versions of libraries instead of system ones on UNIX systems you
should use BUILD_<library_name> CMake flags (for example, BUILD_PNG for the libpng library).

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libjpeg-turbo         libjpeg-turbo is covered by three compatible BSD-style open source licenses.
                      Refer to [LICENSE.md](libjpeg-turbo/LICENSE.md) for a roll-up of license terms.

                      Site: https://github.com/libjpeg-turbo/libjpeg-turbo
                      API is compatible with original libjpeg.

                      WITH_JPEG CMake option must be ON to add libjpeg-turbo support to imgcodecs.
                      SIMD instructions are enabled by default. Use ENABLE_LIBJPEG_TURBO_SIMD to control SIMD instructions.
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libpng                Portable Network Graphics library.
                      The license and copyright notes can be found in libpng/LICENSE.
                      See libpng home page http://www.libpng.org
                      for details and links to the source code

                      WITH_PNG CMake option must be ON to add libpng support to imgcodecs.
                      
libspng               Portable Network Graphics library.
                      The license and copyright notes can be found in libspng/LICENSE.
                      See libspng home page https://libspng.org
                      for details and links to the source code
                      
                      WITH_SPNG CMake option must be ON to add libspng support to imgcodecs
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libtiff               Tag Image File Format (TIFF) Software
                      Copyright (c) 1988-1997 Sam Leffler
                      Copyright (c) 1991-1997 Silicon Graphics, Inc.
                      See libtiff home page #1 http://www.simplesystems.org/libtiff/
                                            #2 https://libtiff.gitlab.io/libtiff/
                      for details and links to the source code

                      WITH_TIFF CMake option must be ON to add libtiff & zlib support to imgcodecs.
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zlib                  General purpose LZ77 compression library
                      Copyright (C) 1995-2022 Jean-loup Gailly and Mark Adler.
                      See zlib home page http://www.zlib.net
                      for details and links to the source code

zlib-ng               zlib data compression library for the next generation systems
                      (C) 1995-2013 Jean-loup Gailly and Mark Adler
                      See zlib-ng official GitHub repository
                      https://github.com/zlib-ng/zlib-ng.git
                      for details and links to source code

                      WITH_ZLIB_NG CMake option must be ON to use zlib-ng as the zlib implementation.
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jasper                JasPer is a collection of software
                      (i.e., a library and application programs) for the coding
                      and manipulation of images.  This software can handle image data in a
                      variety of formats.  One such format supported by JasPer is the JPEG-2000
                      format defined in ISO/IEC 15444-1.

                      Copyright (c) 1999-2000 Image Power, Inc.
                      Copyright (c) 1999-2000 The University of British Columbia
                      Copyright (c) 2001-2003 Michael David Adams

                      See JasPer official GitHub repository
                      https://github.com/jasper-software/jasper.git
                      for details and links to source code
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mlas                  Microsoft Linear Algebra Subprograms — processor-optimized
                      GEMM kernels and platform-specific threading code.
                      Vendored from ONNX Runtime (onnxruntime/core/mlas/), MIT licensed.

                      Copyright (c) Microsoft Corporation
                      Additional MIT-licensed contributions in the source tree:
                          Copyright 2025 Arm Limited (lib/kleidiai/)
                          Copyright 2025 FUJITSU LIMITED (erf/gelu neon fp16)

                      License: see mlas/LICENSE
                      Provenance and local patches: see mlas/README.md
                      Upstream: https://github.com/microsoft/onnxruntime

                      Used by the dnn module's SGEMM dispatch path. Built as
                      an OBJECT library and linked into opencv_dnn when the
                      host arch/OS is wired up (HAVE_MLAS).
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ffmpeg                FFmpeg is a complete, cross-platform solution to record,
                      convert and stream audio and video. It includes libavcodec -
                      the leading audio/video codec library, and also libavformat, libavutils and
                      other helper libraries that are used by OpenCV (in videoio module) to
                      read and write video files.

                      Copyright (c) 2001 Fabrice Bellard

                      The project homepage: http://ffmpeg.org/.
                      
                      * On Linux/OSX we link user-installed ffmpeg (or ffmpeg fork libav).
                      * On Windows we use pre-built ffmpeg binaries,
                        see opencv/3rdparty/ffmpeg/readme.txt for details and licensing information
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