> Jet is effectively a divergent colormap and allows highlighting of extemes
I think one of the issues is that it doesn't actually highlight the extremes, but rather some arbitrary values in the middle: The values with the brightest colours as well as the steepest increases in brightness are in the cyan and yellow sections in the middle, whereas the extremes are dark red and dark blue - so attention is actually pulled away from the extremes.
Likewise, it highlights some contours but will obscure others - and it's difficult to predict which contours will be highlighted and which will be obscured.
I think one of the issues is that it doesn't actually highlight the extremes, but rather some arbitrary values in the middle: The values with the brightest colours as well as the steepest increases in brightness are in the cyan and yellow sections in the middle, whereas the extremes are dark red and dark blue - so attention is actually pulled away from the extremes.
Likewise, it highlights some contours but will obscure others - and it's difficult to predict which contours will be highlighted and which will be obscured.