Custom color palette using R, B, and G values in the dataset

I have a tableau workbook in which I have made a ternary plot. I'm looking 2 get a color palette which I can use for this plot. The data driving the visualization is already calculated in three columns with units as percent (always adding up to 100). Like this: 

A        B         C

10      40       50

20      50       30

1        1         98

80      10       10

So I can convert these to easily create an R value, a G value, and a B value.   My data set has many thousands of rows, and I also want to aggregate them in different ways. So it is not possible to assign an RGB value to each possible data point and then create a custom palette in the preferences TPS file listing all of the possibilities.  I need a more programmatic way of doing this which uses the data set and some sort of custom palette instruction to generate the correct color for each data point.

Any thoughts on how to do this would be greatly appreciated.