: Two-dimensional divergent color scheme? I have some data I want to represent on a choropleth. It's a divergent data vector, but the data has an additional dimension that is a 2-value factor.

@Rivera951

If I understand you correctly, it seems to me that what you need is ColorBrewer – an excellent tool for picking colour schemes for cartography.

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@Cofer715

Pick any two hues from the "Colour Wheel" that turn you on. One hue for YES and its complement for NO. For one extreme of each use a tint and for the other use a shade. Use these four vectors to fill the outline of each of the 50 states in your illustration.

Here is a web safe pure hue sample that is appropriate for normal vision using two hues and their complement. You can use any normal colour picker in PhotoShop to get the hues in the notation that you prefer.



Less attractive are the Web safe hue samples appropriate for a colour-blind reader with protanomaly, protanopy, deuteranopy, deuteranomaly, trianopy, trianomaly, but not achromatopsy or achromatomaly. The RGB coordinates that I chose are noted above the samples.



Assign any values to the continuum that you like or choose your own for the (evidently) secret values you wish to plot.

Have fun. Good luck. Thanks for sharing.

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@Rivera951

In a map you want to highlight two states of being, each of which contain two states of being.

Size is already a factor in your choropleth, so you have only color and pattern to differentiate them.

You could use light and dark green for one group and light and dark red for the other.

You could use four different colors for the 4 states.

You could use 1 color for each of the first group and then indicate Yes or No with patterns.

You could use one color for each group and have a N or Y placed on each.

Would you like more suggestions?

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