This is a large release with many new features.
- Support for HEIFv2 regions (rgan) and user annotations (udes). This enables to annotate regions in the image with several geometric primitives and assign user text descriptions to them. Thank you @bradh for the contributions. Mask support will be added soon.
- Previously, chroma was downsampled and upsampled with a simple nearest-neighbor method. We now included the sharp-yuv chroma downsampling algorithm. This gives improved image quality when images are downsampled to 4:2:0 and upsampled with bilinear interpolation. Thank you @maryla-uc for the contributions.
- The bilinear chroma upsampling and averaging downsampling algorithms are also new. You can choose what to use.
- We added experimental support for decoding uncompressed images according to ISO/IEC 23001-17:2023. This is work in progress and currently decoding only. Thank you @bradh for the contributions.
- There are new APIs to query the image transformations. Thus, you may choose to get the original image and apply the transformations yourself.
- A longstanding bug writing non-compliant 'ispe' boxes (image size) has been fixed. Files should be standard compliant now.
- When building binary packages, you can now make use of a CMake presets to set a default configuration.
- The deprecated autotools build files have been removed.