An interesting article I completely agree with:

https://www.fastcodesign.com/90138569/why-so-many-weather-maps-are-rainbow-colored-and-why-they-shouldnt-be

There are now some better gradient to represent continuous data : https://cran.r-project.org/web/packages/viridis/vignettes/intro-to-viridis.html

Wouldn't it be possible to allow the user to choose one on these predefined gradient?

Ok. Nice to see the preset is an open issue. Here is a test I've just done:

Plasma gradient

Vs default one

An interesting article I completely agree with:

https://www.fastcodesign.com/90138569/why-so-many-weather-maps-are-rainbow-colored-and-why-they-shouldnt-be

There are now some better gradient to represent continuous data : https://cran.r-project.org/web/packages/viridis/vignettes/intro-to-viridis.html

Wouldn't it be possible to allow the user to choose one on these predefined gradient?