Mac Color Picker White instead of Black?

I'll start off with a screenshot.


I'm specifically talking about the bar on the right hand side, that slides from the red I chose to black.

Is there anyway I could have that same sliding-type bar, only sliding from red to white? Is there anyway I could have them both up at the same time? (So I'd have two different sliding bars, one going to the black and one going to the white) (Or actually, even if they could be combined... that would be sweet too. So the sliding bar looks like ms paints sliding bar, basically white, color you have, black)

Thanks for your help! If I'm a little bit too confusing please respond with your question and I'll try to explain it a little bit more.

 

l0l. Okay, come on. My sister is a really good pixel artist, and she'd like to switch to a Mac, but she uses ms paint. We've found Paintbrush, but the main issue is the color picker. If I could get the color picker (via a plugin or something) to act more like ms paint, she'd be sold.

Edit: The slider helps tremendously when doing shading in pixel art, as then you still stay with the same color. If you're selecting all your colors through the circle, you might get off a little bit, and end up with a little more purple than you need in the blue you've chosen. Hopefully that made sense.

 

Ahh, that was very informative. Thanks.

So, basically... we need a saturation slider right next to the color circle. When it's two clicks away, it can be tedious to constantly have to switch back and forth as a pixel artist. There's gotta be a way to do that... as it's right there, we just want it up-front.

 

I wish I did, I'd love to do it. Anyone wanna get hired?