[yt-dev] Default colormap

[B.W. Keller]

There is a really excellent paper on designing color maps called "Color
Sequences for Univariate Maps: Theory, Experiments, and Principles" that
you can get here:
http://ccom.unh.edu/sites/default/files/publications/Ware_1988_CGA_Color_sequences_univariate_maps.pdf

If we design a new colormap, this would be a good reference along with
those scipy resources.  I personally would love to have an accessible,
yt-custom colormap.

On Wed, Jan 6, 2016 at 11:50 AM, Erik Schnetter <schnetter at gmail.com> wrote:

> I think there are several colourmaps that were created when Viridis
> was invented. I personally like Inferno.
>
> -erik
>
> On Wed, Jan 6, 2016 at 11:34 AM, Nathan Goldbaum <nathan12343 at gmail.com>
> wrote:
> > I would also be for coming up with our own colormap. That said, I think
> > simply modifying algae won't be enough, since it is too perceptually
> > nonlinear.
> >
> > On Wed, Jan 6, 2016 at 10:32 AM, John ZuHone <jzuhone at gmail.com> wrote:
> >>
> >> I would go for modifying algae.
> >>
> >> > On Jan 6, 2016, at 11:30 AM, Matthew Turk <matthewturk at gmail.com>
> wrote:
> >> >
> >> > Hi folks,
> >> >
> >> > For a long time we've used "algae," which was designed by Britton
> >> > about eight years ago, as the default colormap.  This has been really
> >> > nice for "branding" yt -- if you see an algae plot, it's probably (not
> >> > definitely) made with yt.  But it's also not accessible from a
> >> > colorblindness perspective.  Stefan van der Walt has been giving some
> >> > really great talks lately about building a better colormap for
> >> > matplotlib (e.g., https://www.youtube.com/watch?v=xAoljeRJ3lU ) which
> >> > culminated in viridis, which is shipping in recent versions of
> >> > matplotlib and will become the default.
> >> >
> >> > In support of this, he built a tool called viscm which can generate
> >> > reduced versions of colormaps to show what they would be like with
> >> > varying degrees of insensitivity to color.  I've generated outputs
> >> > from viscm of three of the custom colormaps we ship with yt:
> >> >
> >> > Algae: https://images.hub.yt/u/fido/m/d275d5e1-png/
> >> > Cubehelix: https://images.hub.yt/u/fido/m/8e698928-png/ (I believe
> >> > this is now also shipped with MPL)
> >> > Kamae: https://images.hub.yt/u/fido/m/e0e40efa-png/
> >> >
> >> > I love algae, but it's not the best from an accessibility perspective.
> >> >
> >> > I'd like to propose that we use a new default colormap.  If we do
> >> > this, I see two options:
> >> >
> >> > * Retain a "branding" by developing a new one either by using the
> >> > techniques used by matplotlib (or one of the maps they opted not to
> >> > use) or by modifying algae to be more accessible; looking at the
> >> > response functions, I suspect it would be reasonably possible to
> >> > modify it.  (Modifying algae is my preference.)
> >> > * Use viridis (which we may then have to ship if we have older
> >> > versions of matplotlib to support)
> >> >
> >> > -Matt
> >> > _______________________________________________
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> >>
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>
>
> --
> Erik Schnetter <schnetter at gmail.com>
> http://www.perimeterinstitute.ca/personal/eschnetter/
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