I almost always select AB colors in pairs for the brushes I make. You can setup a custom STORE AB button using one of the Tool Grabber commands:
GrabColor:ABPen
Each time you click your custom pick AB button, it automatically generates a new, unique color button where the current B color is the background and the current A color is a superimposed circle. You can quickly setup a whole custom panel of such pairs for any project.
Note that each new AB color button is added to the bottom of the panel and can then be moved to which ever subset you want. Clicking any color icon assigns the APen and BPen to have the values stored inside that button.
- Custom AB Color Panel.jpg (15.3 KiB) Viewed 8179 times
oops! ===============================================================================
Re-reading your question, I see that what you really want is the ability to select an existing color from the frame as the APen and have a slightly darker version of that color automatically assigned to the BPen. Hmm.
Check out the button command = KeyStroke Key:Color:Luminosity -
It only works by decrementing luminosity one unit at a time, if you knew how many units you wanted, you could probably setup a button that would first copy APen to BPen, then decrement APen x number of units (repeating the Key:Color:Luminosity - command) then swap APen and BPen something like this:
- Luminosity button script.jpg (41.66 KiB) Viewed 8179 times
Note that this would be a much easier thing to do if GEORGE had a command that let you set Hue, Saturation and/or Luminosity amounts for the APen and BPen colors directly... (requested before)
Sven