2.0.0

Added

• Expose "speed" parameter in heifsave to control the CPU effort spent on improving compression (applies to AV1 compression only, see libvips/libvips#1819).
• Add missing ForeignPngFilter enum (#106).
• Add missing image.AddAlpha() operation (#116).
• Add image.Mutate function for creating an MutableImage (#119).

Fixed

• Ensure images are disposed early throughout the codebase (#114).

Changed

• Move cache/statistics helpers to dedicated classes (#98).
• Use enumerations where possible (#112).
• Methods which modify the image, such as setting or removing metadata requires an MutableImage (see image.Mutate).