RELEASE_NOTES.md: document user-selectable chroma subsampling for AVIF export #19610
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…F export This update to the release notes highlights the new feature that lets users pick between auto, 4:4:4, 4:2:2, and 4:2:0 modes, separate from quality settings, to balance quality and size.
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Pull Request Overview
This PR adds a new feature to the AVIF export functionality by introducing manual chroma subsampling control. Users can now explicitly select chroma subsampling modes (auto, 4:4:4, 4:2:2, and 4:2:0) independent of quality settings, providing more granular control over the quality-size tradeoff.
- Added manual chroma subsampling control for AVIF export with multiple mode options
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This update to the release notes highlights the new feature introduced in #19595 that lets users pick between auto, 4:4:4, 4:2:2, and 4:2:0 modes, separate from quality settings, to balance quality and size.