[yt-dev] Default colormap

Thu Jan 21 10:13:56 PST 2016

here's a link:

http://eric.ed.gov/?id=EJ1005874

really cool stuff.

On Thu, Jan 21, 2016 at 1:10 PM, Nathan Goldbaum <nathan12343 at gmail.com>
wrote:

> I think we should probably put it up for a vote and we should send an
> e-mail to yt-users about it.
>
> On Thu, Jan 21, 2016 at 12:06 PM, Matthew Turk <matthewturk at gmail.com>
> wrote:
>
>> Hi folks,
>>
>> I've put up a comparison image:
>>
>> http://i.imgur.com/Afxdb0G.jpg
>>
>> Left is Kacper, middle is me, right is Nathan.
>>
>> Honestly I think all could go in, but we should pick a default -- whether
>> it's one of these or a different one.  Anyone have a strong opinion?
>>
>> -Matt
>>
>> On Mon, Jan 18, 2016 at 10:19 AM, B.W. Keller <kellerbw at mcmaster.ca>
>> wrote:
>>
>>> Wow, all of these look great.  I think I like Matt's best for painting
>>> our bikeshed, but I would be happy with any of them.
>>>
>>> On Mon, Jan 18, 2016 at 11:10 AM, Kacper Kowalik <
>>> xarthisius.kk at gmail.com> wrote:
>>>
>>>> On 01/18/2016 09:45 AM, Matthew Turk 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.
>>>>
>>>> This is my experiment:
>>>>
>>>> https://images.hub.yt/u/fido/m/f180a901-png/
>>>>
>>>> Source:
>>>>
>>>> http://paste.yt-project.org/show/6166/
>>>>
>>>> Cheers,
>>>> Kacper
>>>>
>>>>
>>>> >
>>>> > 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
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>>>> >>>>>
>>>> >>>>>
>>>> >>>>>
>>>> >>>>> _______________________________________________
>>>> >>>>> yt-dev mailing list
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>>>> >>>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>> --
>>>> >>>> Erik Schnetter <schnetter at gmail.com>
>>>> >>>> http://www.perimeterinstitute.ca/personal/eschnetter/
>>>> >>>> _______________________________________________
>>>> >>>> yt-dev mailing list
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>>>> >>>
>>>> >>>
>>>> >>>
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-- 
Michael Zingale
Associate Professor

Dept. of Physics & Astronomy • Stony Brook University • Stony Brook, NY
11794-3800
*phone*:  631-632-8225
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