I love gradient maps - especially animated ones. They take me right back to my early programming days on my Amiga.

I built a mapToGradient filter for my canvas library - it's probably no use to man nor beast, but my library was incomplete without it!

https://scrawl-v8.rikweb.org.uk/demo/filters-022.html

I was exploring ways to generate a gradient map without using Photoshop. And got the idea: why not create a Figma plugin? And here it is, it can also work on the web.