Why obviously? There's a collection of discussed filters here: https://www.northlight-images.co.uk/using-effects-lens-filters/ https://www.northlight-images.co.

Why obviously? There's a collection of discussed filters here: https://www.northlight-images.co.uk/using-effects-lens-filters/ https://www.northlight-images.co.uk/using-effects-lens-filte... Some colour filters are more than just colour correction. At least one of those results in intentional spatial transformation. Is that allowed?