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Tag Archives: rainbow colormap

Busting bad colormaps with Python and Panel

September 17, 2020by matteomycarta Leave a comment

I have not done much work with, or written here on the blog about colormaps and perception in quite some time. Last spring, however, I decided to build a web-based […]

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Application, Cartography and mapping, Color, Color, color-2, color-2, Geophysics, Geoscience, Geoscience, Image Processing, Programming and code, Python, VIsualization

How to fix rainbows and other bad colormaps using Python

September 26, 2018by matteomycarta 3 Comments

Yep, colormaps again! In my 2014 tutorial on The Leading Edge I showed how to Evaluate and compare colormaps (Jupyter notebook here). The article followed an extended series of posts (The rainbow […]

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Color, color-2, Geophysics, Geoscience, Programming and code, Python, Tutorial

Logarithmic spiral, nautilus, and rainbow

November 28, 2014by matteomycarta 2 Comments

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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Color, Geology, Geoscience, Graphics, Matlab, Programming and code, Research, Tutorial, VIsualization

Spectral lightness rainbow colormap

November 18, 2014by matteomycarta Leave a comment

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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Cartography and mapping, Color, Geoscience, Matlab, Programming and code, Tutorial, VIsualization

New rainbow colormap: sawthoot-shaped lightness profile

November 13, 2014by matteomycarta 6 Comments

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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Color, Graphics, Matlab, Programming and code, Tutorial, VIsualization

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

November 3, 2014by matteomycarta 7 Comments

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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Color, Geophysics, Geoscience, ImageJ, Matlab, Programming and code, Tutorial, VIsualization

Geophysical tutorial – How to evaluate and compare colormaps in Python

November 3, 2014by matteomycarta 2 Comments

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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Color, Geophysics, Geoscience, Programming and code, Python, Tutorial, VIsualization

New Matlab isoluminant colormap for azimuth data

October 30, 2014by matteomycarta 2 Comments

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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Color, Geophysics, Geoscience, Matlab, Programming and code, Tutorial, VIsualization

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Go ahead if you want to use my code, modify it, improve it, for non-commercial AND for commercial use. You are also welcome to download and reuse my media files - unless otherwise stated. With both code and images, please give full and clear credit to Matteo Niccoli as the author and mycarta.wordpress.com as the source.
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