[![enter image description here][1]][1][![enter image description here][2]][2]

Not complete as it is lacking the ability to use hex, enter the channels separately and also to remember colors.

It has :

- Large stripes for better selection
- One for hues
- One for a gradient towards gray, varying saturation
- One for a gradient between white and black, varying value
- A large field to preview
- The option to vary the stroke color toward the background color
- A reset to black&white button

  [1]: https://i.sstatic.net/pW25z.png
  [2]: https://i.sstatic.net/R9EpY.png