Currently, tiles for all bands and indices are rendered using the same color scale to demonstrate intensity.
Suggest rendering visible light bands on a spectrum indicative of their color (e.g. light red or gray to dark red for red band),
and reserving the current purple-to-yellow spectrum for nonvisible bands. This would help a user better understand what the data represents.
There is some work in RasterFrames toward this: https://rasterframes.io/release-notes.html#0-8-5 See notes about the color ramp and further references https://rasterframes.io//reference.html#rf-render-color-ramp-png
The current Notebook depends on 0.8.4 but 0.8.5 is coming!