I asked a bunch of users to run my color palette test field and post photos. People with a wide variety of watches responded. I had to tweak the RED pair for the Fenix 5x. I needed a decent light/dark contrast for a number of colors. The lap button toggles between the 64 color grid and a 6-color light/dark. The AMOLED and LCD displays are of course amazing, but the MIP ones were more challenging. In case this is helpful to anyone, here are the HEX codes I ended up with.
This screen show is just the simulator for a FR955, but you can't trust the sim colors. It does look good on my actual FR955.
apps.garmin.com/.../ff11a00c-b563-45d5-9cff-c9feff6b5f5e
const myWHITE = 0xFFFFFF, myBLACK = 0x000000;
const myLBLUE = 0x00FFFF, myDBLUE = 0x0000FF;
const myLORANGE = 0xFFA500, myDORANGE = 0xCC6600;
const myLGREEN = 0x55FF55, myDGREEN = 0x006600;
const myLRED = 0xFF0000, myDRED = 0x660000;
const myLYELLOW = 0xFFFF55, myDYELLOW = 0xAAAA00;
const myLPURPLE = 0xFF00FF, myDPURPLE = 0x800080;