When working with AVIF, a next-gen image format, Kirby won’t resize it because the internal check doesn’t recognize it as ‘resizable’. This might be accomplished by implementing a custom
thumb method which doesn’t rely on checking if
isResizable, but I don’t want to break third-party plugins and their
Furthermore, it is unclear why Kirby, by itself not involved in the resize process (GD & Imagick are), deems some formats resizable, hardcoding the decision. For now, there’s no way to hook into that. IMHO, removing hardcoded resize definitions altogether might be something to consider. Otherwise, we should at least be able to extend it.
For more information, see this forum thread or the related issue on GitHub.