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Ian Lyttle

Very excited to participate on Haley Jeppson’s panel for “Use of Color in Statistical Charts” at ! (Sunday 2-4 PM, CC-810)

I’ll use this (in progress) collection of @observablehq notebooks for computing on color:

observablehq.com/collection/@i

Thanks to @zeileis, whose colorspace package in R inspired much of this work:

hclwizard.org/r-colorspace

ObservableComputing on color
Aug 06, 2023, 11:22 AM·Public
9boosts·15favorites
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Achim Zeileis

@ijlyttle @observablehq Very nice, impressive collection of useful tools! The interactive widgets are particularly fun to play around with.

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Achim Zeileis

@ijlyttle @observablehq Re: Unresolved thoughts on color vision deficiency.

In addition to the model-based implementation in #rstats {colorspace}, there is the classic {dichromat} based on experimental work by Brettel, Mollon, and Viénot in the late 1990s.

You can use these to check the differences.

CRAN.R-project.org/package=dic

cran.r-project.orgdichromat: Color Schemes for DichromatsCollapse red-green or green-blue distinctions to simulate the effects of different types of color-blindness.
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Achim Zeileis

@ijlyttle @observablehq Comparison of deutan emulations:

library("colorspace")
library("dichromat")
vi <- hcl.colors(9)
rb <- rainbow(9)

swatchplot(list(
"viridis" = rbind(
original = vi,
colorspace = deutan(vi),
dichromat = dichromat(vi, "deutan")),
"rainbow" = rbind(
original = rb,
colorspace = deutan(rb),
dichromat = dichromat(rb, "deutan"))),
nrow = 4)

Comparison of color vision deficiency emulations for the viridis and rainbow palettes. Three versions are shown for each palette: the original in full color, a deuteranope emulation using colorspace::deutan() based on the model-based Machado et al. approach, and another deuteranope emulation using dichromat::dichromat(..., "deutan") based on the experimental work of Brettel et al.
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Ian Lyttle

@zeileis @observablehq Thanks once more! I'm relieved to notice only small differences in the results; looking forward to checking out "dichromat"!

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Ian Lyttle

@zeileis @observablehq Thanks Achim! It was driven by curiosity on things like "how do color spaces differ?", and "how do colors collapse under CVD?".

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Achim Zeileis

@ijlyttle @observablehq Yes, I can very much relate to that! This kind of curiosity inspired a lot of the functionality in colorspace.

I'm very happy to see that this was useful to you and that you took everything a couple of steps further.

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