Hi all,
I stumbled across a fairly new post from the Lospec forums. It brought me back to our conversation here. 
https://lospec.com/forums/topic/127/censor-a-perceptual-palette-analyser/1
To quote from the original:
Source: GitHub - Quickmarble/censor: A perceptual palette analyser..
License: MIT.Censor is a standalone command-line palette analyser inspired by DawnBringer’s Palette Analyser for GrafX2 and having a compatible layout. Among numerous differences,
All widgets use CAM16UCS with perceptual colour distance;
You can load palettes from command arguments, text files, images and Lospec;
Daemon mode can be used for larger numbers of analysis requests;
There will be support for using the analyser in web pages after compiling it into WASM.
Seems that CAM16 refers to Color Appearance Model.
The program is written in the programming language Rust, and the instructions for using it on the Github readme assume you’ve already installed the language. Here is a test run I did with the Pico 8 palette:
Looks exciting.
Best,
Jeremy