Upcoming book: 52 things you should know about Geocomputing
I am very excited to write that, after a successful second attempt at collecting enough essays, the book 52 Things You Should Know About Geocomputing, by Agile Libre, is very […]
Tag Archives: colormap
Reinventing the color wheel – part 2
In the first post of this series I argued that we should not build colormaps for azimuth (or phase) data by interpolating linearly between fully saturated hues in RGB or HSL space. A first step […]
Reinventing the color wheel – part 1
In New Matlab isoluminant colormap for azimuth data I showcased a Matlab colormap that I believe is perceptually superior to the conventional, HSV-based colormaps for azimuth data, in that it does not […]
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 […]
Convert Matlab colormap to Surfer colormap
In the comment section of my last post, Steve asked if I had code to generate a Surfer.clr file from my Matlab colormaps. Some time ago I did write a […]
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 […]
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 […]
Visualizing colormap artifacts
In Evaluate and compare colormaps, I have shown how to extract and display the lightness profile of a colormap using Python. I do this routinely with colormaps, but I realize […]
