So I am making a heat map, and my color gradient goes from green, to black in the center, to red. I would like to customize my gradient so that the black extends from exactly -1 to +1. My data set range is -2 (green) to 7 (red). So with me wanting the black area to extend from -1 to +1, this makes the gradient lopsided with the red area being much longer, which is fine. But since it is lopsided towards the green end it is possible for me to have a nice crisp edge between the green and black at -1 just using the slider tool. But a side effect of this is that the gradient between the black and red is much more gradual and I basically can't get the black edge to be around +1. This makes a large swatch of my data points a muddy dark red, when I would like for there to be a little bit more solid red. Is there a way to customize in this way?
