v1.14.0 - codec plugins / svt-av1 backend

• adds SVT-AV1 encoder as AVIF backend
• dynamic plugin interface for installing codecs independently from libheif (currently Unix only)
• add XMP header compression (using zlib)
• library should now be initialized with heif_init()
• heif_convert: extract EXIF and XMP to separate files
• heif_enc: add benchmarking function to compare codecs
• copy EXIF/XMP between HEIC/AVIF files and JPEG/PNG in all kinds of combinations
• remove EXIF orientation tag from input when converting to HEIC/AVIF and generate irot/imir boxes matching the input orientation

v1.13.0

• pay attention to the correct chroma sample positions
• heif_image now holds a list of decoding warnings
• use AOM AOM_USAGE_ALL_INTRA mode instead of AOM_USAGE_GOOD_QUALITY
• 'strict' decoding mode with more checks for standard conformity of input
• support for EXIF data >64k in JPEG output
• proper library initialization and cleanup
• separate quality settings for alpha channel (AOM)
• improve color conversion speed (no lroundf)
• build and packaging fixes

v1.12.0 - MIAF conformance / premultiplied alpha

• check for MIAF conformance and add as compatible brand
• signaling of premultiplied alpha
• parse AV1 obu_sequence_header for av1C box
• write pixi box in AVIFs
• save alpha as monochrome in AVIF if possible
• many build fixes (thanks to the numerous external contributors)

macOS compatibility fixes

• fix writing ispe box in HEIFs
• nclx output profile encoding parameters
• change the way nclx profiles is written so that macOS can read them
• API for listing file brands and checking file type
• fix heif_image_handle_get_depth_image_representation_info()

v1.10.0 - read all auxiliary images, improve macOS compatibility

• new API: may access all (vendor-dependent) auxiliary images (e.g. hdrgainmap, semanticskinmatte, ...)
• change the way images with odd sizes are written so that macOS can read them
• when ICC profile is present, will now write two colr boxes (nclx and ICC) into AVIF files. Also reads files with two colr boxes
• alpha image is now saved as monochrome
• loading of 16bit greyscale PNGs in heif_enc
• heif_enc, option "-E" deprecated
• remove dependency on alloca()
• fix known bugs

v1.9.1 - fix compilation bug in C++ wrapper

• fixed missing inline definition in C++ wrapper
• add dav1d decoder plugin for faster decoding of AVIF images
• support for images having both ICC and NCLX profiles
• save NCLX profiles to AV1/HEVC bitstreams and also read them from the bitstream
• add color profile API to C++ wrapper
• improve rounding in color conversions
• conformant encoding of AVIF images <16 pixels
• many fixes and small improvements

v1.8.0 - faster AVIF with rav1e, gdk-pixbuf with AVIF, nclx color profile handling

• Integration of rav1e encoder for faster AVIF encoding
• gdk-pixbuf loader now supports AVIF decoding
• color conversion adapts to nclx color profile
• new parameters for heif-enc to set nclx parameters
• support for saving in RGB colorspace (matrix_coefficients=0) for true lossless encoding
• chroma 4:2:2 and 4:4:4 encoding for HEIF
• chroma 4:2:2 and 4:4:4 with AVIF, also with HDR
• monochrome AVIF encoding with AOM plugin
• changed AVIF bitrate control depending on quality parameter
• support for AVIFs with depth images
• AVIF MIME type detection
• update Go API for HDR images
• write libheif and plugin version info to HEIF/AVIF headers
• fix problems with odd image resolutions and very small image sizes
• fix writing too much data into alpha channel images
• lots of bug fixes and handling of corner cases

AVIF Support

Support for reading and writing AVIF (8 bit) images through libaom has been added.
Other encoders/decoders can be added with the plugin architecture.
Decoders don't need any code change to also read AVIF images.
Encoders can reuse the existing HEIF code and simply use heif_compression_AV1 to output AVIF.

Other changes:

• HDR image rotation
• HDR to 8 bit conversion
• accept images with only the 'mif1' brand
• bug fixes

HEIX support

• support for HEIX images (10, 12 bit and chroma 4:2:2)
• security limits for maximum image sizes have been increased
• gdk pixbuf loader fixes

maintenance release

• fix crash in gdk-pixbuf plugin
• fix several decoding bugs
• increase security limits for huge files
• modernize cmake build scripts