Another options

https://itsjavi.com/bootstrap-colorpicker/

http://www.dematte.at/tinyColorPicker/index.html?type=input#demo

I do understand the use for the alpha channel. We haven't implemented it yet because we found no picker that has an actual wheel for picking the hue, which we believe is so much nicer than those boxed color pickers.

We'll see if we can add alpha to our current color wheel.

Hi, is this branch going stale or is it completed and wait implimentation?

Related:
https://github.com/b2evolution/b2evolution/tree/feature/color-wheel-with-alpha-channel
http://forums.b2evolution.net/validation-for-input-field-type-of-color-to

It will be merged in. A lot of backlog we have.