sharp-avif-metadata

How sharp reads AVIF metadata

About

This repository demonstrates how the Sharp image processing library handles AVIF file metadata.

Key Finding

When reading AVIF files, Sharp reports the format as 'heif' (not 'avif') because AVIF is based on the HEIF container format. The actual codec can be identified through the compression field, which will be 'av1' for AVIF files.

Installation

npm install

Running Tests

npm test

The test:

1. Reads a PNG image (test-image.png)
2. Converts it to AVIF format
3. Reads the AVIF metadata
4. Verifies that format is 'heif' and compression is 'av1'