Now that I've detected my color ramp is inadequate, where can I find a good one? Am I limited to greyscale or other single-hue ramps? Do I need multiple color ramps for deuteranopia vs protanopia?
Depends, I assume. The original Destiny had color palettes for every type of color blindness iirc, you could select whichever one you wanted. That was a really nice feature for a FPS, where you need to be able to determine allies/enemies at a glance.
If you didn't want to do separate palettes, which I imagine could be a lot of work, you could create your own. I imagine if you varied the tint/shade/tone enough you could (probably?) get a set of colors (with different hues) that would be differentiable across all forms of colorblindness.
Disclaimer: I'm not a designer _at all_. Somewhat on topic, my favorite quick tool for colors is colorhexa dot com. At the bottom of each color page they have a color blindness simulator.
See the links I posted in my reply to another comment here: https://news.ycombinator.com/item?id=16343367. There's some good information in those talks about how you can tackle mapping information.
If you didn't want to do separate palettes, which I imagine could be a lot of work, you could create your own. I imagine if you varied the tint/shade/tone enough you could (probably?) get a set of colors (with different hues) that would be differentiable across all forms of colorblindness.
Disclaimer: I'm not a designer _at all_. Somewhat on topic, my favorite quick tool for colors is colorhexa dot com. At the bottom of each color page they have a color blindness simulator.