# Logarithmic spiral, nautilus, and rainbow

The other day I stumbled into an interesting article on The Guardian online: The medieval bishop who helped to unweave the rainbow. In the article I learned for the first time of Robert […]

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# Spectral lightness rainbow colormap

Spectral lightness rainbow Quick post to share my replica of Ethan Montag ‘s Spectral lightness colormap from this paper. My version has a linear Lightness profile (Figure 1) that increases monotonically […]

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# New rainbow colormap: sawthoot-shaped lightness profile

Why another rainbow In the comment section of my last post Steve Eddins from Mathworks reported that some Matlab users prefer Jet to Parula, the new default perceptual colormap in Matlab, because within certain ranges […]

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# What your brain does with colours when you are not “looking” – part 2

In What your brain does with colours when you are not “looking”, part 1, I displayed some audio spectrogram data (courtesy of Giuliano Bernardi at the University of Leuven) using 5 different colormaps to render the amplitude […]

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# Geophysical tutorial – How to evaluate and compare colormaps in Python

These below are two copies of a seismic horizon from the open source Penobscot 3D seismic survey  coloured using two different colormaps (data from Hall, 2014). Do you think either of them is ‘better’?  […]

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# New Matlab isoluminant colormap for azimuth data

I recently added to my Matlab File Exchange function, Perceptually improved colormaps, a colormap for periodic data like azimuth or phase. I am going to briefly showcase it using data from my degree […]

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# Colormap compromise

At the end the series The rainbow is dead…long live the rainbow! I introduced CubicYF, a rainbow-like color palette with a slightly compressive, monotonic increasing lightness profile. The red color is missing from the palette because green […]

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# Parula: a new Matlab colormap

Steve Eddins of the Matwork just published a post announcing a new Matlab colormap to replace Jet. It is called Parula (more to come on his blog about this intriguing name). […]

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