[yt-dev] Default colormap

Wed Jan 27 20:22:09 PST 2016

I'd like to propose this colormap:

http://i.imgur.com/nKFZWSC.png

Script here:

http://paste.yt-project.org/show/6194/

Cameron

On Thu, Jan 21, 2016 at 11:05 AM, Matthew Turk <matthewturk at gmail.com>
wrote:

> Sounds good, but before we do that, I think we should have a suitable
> waiting period for others to propose them.  I'll send an email out to
> yt-users asking for ideas on it.
>
> On Thu, Jan 21, 2016 at 12:10 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
>>>>> >>>>>> 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
>>>>> >>>
>>>>> >>>
>>>>> >>>
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>>>>> >>>
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>>>>> >
>>>>>
>>>>>
>>>>>
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-- 
Cameron Hummels
NSF Postdoctoral Fellow
Department of Astronomy
California Institute of Technology
http://chummels.org
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