This particular color test is tricky because it's not a simple linear progression. After finishing the test, I converted the RGB values to HSV and found irregular jumps in hue (sometimes 3 degrees, sometimes 6) along with nonlinear changes in saturation and value levels. The irregularity probably makes it a better test, but it's annoying because when it's "perfect" it still looks ragged. :-)
> The irregularity probably makes it a better test, but it's annoying
This made me take a look at what they're doing and the sRGB vals map fairly close to their Munsell counterparts. The value has been fixed which is nice for this kind of test, but yeah non-linear hue progression. Probably helps as a discernment test considering how much closer the center colors are to each other.
