[yt-dev] Default colormap

Nathan Goldbaum nathan12343 at gmail.com
Mon Jan 18 07:52:53 PST 2016


The one I came up with is here:

http://imgur.com/HhdqA3T

The script is here:

http://paste.yt-project.org/show/6165/

On Mon, Jan 18, 2016 at 9:45 AM, Matthew Turk <matthewturk at gmail.com> wrote:

> Hi all,
>
> I've experimented a bit and come up with this:
>
> https://images.hub.yt/u/fido/m/9bbe3cf6-png/
>
> The script:
>
> http://paste.yt-project.org/show/6151/
>
> This was designed with the viscm project, which is awfully cool.  What
> do folks think?  I think Kacper and Nathan also experimented with
> viscm and have some ideas too, so maybe we should put it up for an
> eventual vote.
>
> Also, I would campaign for calling whatever our new colormap turns out
> to be one of these three things, in increasing order of my preference:
>
> agar
> kelp
> kanten
>
> -Matt
>
> On Thu, Jan 14, 2016 at 10:57 AM, Matthew Turk <matthewturk at gmail.com>
> wrote:
> > Hi Stuart and everyone else,
> >
> > This is great info.  I appreciate everyone's thoughtful replies.
> >
> > Having both a sequential colormap (which would replace algae) and a
> > diverging colormap, would be awesome.  The Paraview devs shipped the
> > new matplotlib ones (like Inferno) in 5.0.  I think it would be a fun
> > experiment to see if we can come up with something sufficiently
> > "branded" or different.  And then if we can't, fall back on something
> > like Inferno?
> >
> > -Matt
> >
> > On Wed, Jan 6, 2016 at 12:48 PM, Levy, Stuart A <salevy at illinois.edu>
> wrote:
> >> There was a fair bit of discussion about colormaps - terrible, useful,
> >> beautiful - at IEEE Vis last October.   The viridis colormap was a
> featured
> >> one.   So was the traditional rainbow, which lots of info-vis and
> perceptual
> >> people piled on to criticize.
> >>
> >> Among design criteria for a continuous-valued colormap is whether it's
> >> "sequential" (like the typical yt colormap, or viridis) or "diverging".
> >> You'd want a diverging colormap to show signed deviations from a norm -
> >> where the eye should be caught by places where a value is either much
> less
> >> than, or much more than, something in the middle.   Is it worth
> offering a
> >> typical divergent colormap, as well as a new typical sequential one, in
> yt?
> >>
> >> Note that among the Stefan van der Walt & Nathaniel Smith writeup (
> >> http://bids.github.io/colormap/ ) on their development of better
> cmaps, they
> >> use Nathan Goldbaum's galaxy evolution as a test case for six
> (sequential)
> >> examples! => http://vorpus.org/~njs/goldbaum-galaxies-all-colormaps.mkv
> >>
> >> A neat web site with sample colormaps - aimed at mapping discrete
> values on
> >> geographic maps, so not directly applicable but cool - is this, by
> Cynthia
> >> Brewer and Mark Harrower at PSU:
> >>     http://colorbrewer2.org/
> >> It has a library of predesigned cmaps, and lets you sift them by being
> >> colorblind-safe, photocopy safe, etc.
> >> ________________________________
> >> From: yt-dev [yt-dev-bounces at lists.spacepope.org] on behalf of B.W.
> Keller
> >> [kellerbw at mcmaster.ca]
> >> Sent: Wednesday, January 06, 2016 12:13
> >> To: yt-dev at lists.spacepope.org
> >> Subject: Re: [yt-dev] Default colormap
> >>
> >> 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
> >>> >> > _______________________________________________
> >>> >> > yt-dev mailing list
> >>> >> > yt-dev at lists.spacepope.org
> >>> >> > http://lists.spacepope.org/listinfo.cgi/yt-dev-spacepope.org
> >>> >>
> >>> >> _______________________________________________
> >>> >> yt-dev mailing list
> >>> >> yt-dev at lists.spacepope.org
> >>> >> http://lists.spacepope.org/listinfo.cgi/yt-dev-spacepope.org
> >>> >
> >>> >
> >>> >
> >>> > _______________________________________________
> >>> > yt-dev mailing list
> >>> > yt-dev at lists.spacepope.org
> >>> > http://lists.spacepope.org/listinfo.cgi/yt-dev-spacepope.org
> >>> >
> >>>
> >>>
> >>>
> >>> --
> >>> Erik Schnetter <schnetter at gmail.com>
> >>> http://www.perimeterinstitute.ca/personal/eschnetter/
> >>> _______________________________________________
> >>> yt-dev mailing list
> >>> yt-dev at lists.spacepope.org
> >>> http://lists.spacepope.org/listinfo.cgi/yt-dev-spacepope.org
> >>
> >>
> >>
> >> _______________________________________________
> >> yt-dev mailing list
> >> yt-dev at lists.spacepope.org
> >> http://lists.spacepope.org/listinfo.cgi/yt-dev-spacepope.org
> >>
> _______________________________________________
> yt-dev mailing list
> yt-dev at lists.spacepope.org
> http://lists.spacepope.org/listinfo.cgi/yt-dev-spacepope.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.spacepope.org/pipermail/yt-dev-spacepope.org/attachments/20160118/58f0ccdc/attachment.html>
-------------- next part --------------
_______________________________________________
yt-dev mailing list
yt-dev at lists.spacepope.org
http://lists.spacepope.org/listinfo.cgi/yt-dev-spacepope.org


More information about the yt-dev mailing list