What your brain does with colours when you are not “looking” – part 1

When I published the last post of my series The rainbow is dead…long live the rainbow! there was a great discussion in the comments section with Giuliano Bernardi, a Ph.D. student at the University of Leuven, on the use of different colour palettes in audio spectrogram visualization.

Since then Giuliano has been kind enough to provide me with the data for one of his spectrograms, so I am resuming the discussion. Below here is a set of 5 figures generated in Matlab from the same data using different colormaps. With this post I’d like to get readers involved and ask to cast your vote for the colormap you prefer, and even drop a line in the comments section to tell us the reason for your preference.

In the second post I’ll show the data displayed with the same 5 colormaps but using a different type of visualization, which will reveal what our brain is doing with the colours (without our full knowledge and consent), and then I will ask again to vote for your favourite.


Take Our Poll


A – Jet colormap

B – Gray scale

C – Linear Lightness rainbow

D – Modified heated body (linear Lightness)

E – Cube-law Lightness rainbow