Hello everyone,
I’ve come across the need for RGBA myself too at times so I’m with you there.
@herrfischer s link to a third party plugin should do well until this is implemented. As far as implementation goes it’s not as easy as you would think.
ACF is using WordPress Core Color picker called Iris. Iris supports many different color types (?) but unfortunately not RGBA (it does support RGB tho).
There’s a lot of requests for this feature on Iris github repo (https://github.com/Automattic/Iris) but so far the author has yet to implement it and doesn’t seem to like the forks people have done. So to support this in ACF Elliot would either have to switch to a different color picker (meaning another script to load in admin) or wait for it to be implemented in core.
I would suggest using the third party plugin until then 🙂
