matplotlib-devel — matplotlib developers

Re: [matplotlib-devel] release strategy and the color revolution

[Benjamin R. <ben...@ou...>]

The problem I have with hcl is that while it is technically "colorful" (or
whatever the term may be), only the reds really come out because the other
colors are only used when either really light or really dark.  Perhaps
squashing the brightness range a bit and let the natural lightness of
yellow and the natural darkness of blue come through on their own.  (does
that even make any sense to anybody else? it makes sense in my head, but I
am certainly am not an expert in color perception)

Ben Root

P.S. - Of course, my own color perception weirdness might be at play here
and the colormap looks perfectly fine to everybody else...


On Wed, Feb 18, 2015 at 11:17 AM, Maximilian Albert <
max...@gm...> wrote:

> 2015-02-17 1:23 GMT+01:00 Michael Waskom <mw...@st...>:
>
>> See [here](http://nbviewer.ipython.org/gist/mwaskom/6a43a3b94eca4a9e2e8b)
>> for a quick and dirty implementation that should get a general idea. This
>> probably ins't the best way to do it -- anyone should feel free to build on
>> this.
>>
>
> This is very neat! Great job. Incidentally, when I stumbled upon the
> earthobservatory blog a while ago this particular colormap also caught my
> eye as a potential candidate, so I'm glad you suggested it as a starting
> point for a new matplotlib default.
>
> Out of curiosity, I applied Nathaniel's "viscm" function (from the
> previous thread) to the colormap from your notebook (screenshot attached).
> Interestingly, while it confirms that the lightness and hue angle increase
> more or less linearly, the "colourfulness" goes up and down in waves, even
> though you designed the chroma to increase linearly, too. I'm not sure
> whether this is because "colourfulness" and "chroma" are actually two
> different concepts, or whether it has to do with inaccuracies and/or
> clamping during the conversion between various colour spaces. It could also
> be the case that the colormath and pycam02ucs modules use different
> conversion formulas (in which case it would be good to know which is "more
> accurate"; not sure there is even an objective measure for "accuracy" in
> this case). Also, there seems to be something strange going on at the dark
> (blue) end of the colormap, but this could again be due to clamping.
>
> I'd love to play a bit more with your example notebook but not sure I'll
> be able to do so before the weekend (or early next week).
>
> Cheers,
> Max
>
>
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[matplotlib-devel] Produce text runs in the postscript backend

[Eric M. <ew...@re...>]

Hi,

I posted on the user list a while back about saving editable text using the
postscript backend [1].  There I was informed that this was changed a few
years ago to individually place glyphs.  It looks to me, that this change
was about correctly supporting unicode in this backend [2].

Would the project be open to changing this to produce text runs when all of
the characters are ascii? This way, the general unicode case should still
work but runs of text where the special handling is not necessary should
result in editable text.  I'm happy to work up a patch, but I don't want to
spend the time if there is no hope of it being merged.

My use case is to be able to make some tweaks to figures post mpl.  In my
case this tends to be to either combine figures from several sources into a
single coherent figure or to adjust the figure size or spacing slightly so
the final figure fits into the space available.  All of this can be done in
mpl directly, but in terms of effective use of my time, opening the figure
in Corel Draw, Inkscape or Illustrator is much faster since I can get the
figure 90% of the way there quickly and easily using mpl.

Eric

1. http://thread.gmane.org/gmane.comp.python.matplotlib.general/34816
2.
https://github.com/matplotlib/matplotlib/commit/80321a3b489994748b79e41bc34a65f836a9a03f

Re: [matplotlib-devel] release strategy and the color revolution

[Maximilian A. <max...@gm...>]

2015-02-17 1:23 GMT+01:00 Michael Waskom <mw...@st...>:

> See [here](http://nbviewer.ipython.org/gist/mwaskom/6a43a3b94eca4a9e2e8b)
> for a quick and dirty implementation that should get a general idea. This
> probably ins't the best way to do it -- anyone should feel free to build on
> this.
>

This is very neat! Great job. Incidentally, when I stumbled upon the
earthobservatory blog a while ago this particular colormap also caught my
eye as a potential candidate, so I'm glad you suggested it as a starting
point for a new matplotlib default.

Out of curiosity, I applied Nathaniel's "viscm" function (from the previous
thread) to the colormap from your notebook (screenshot attached).
Interestingly, while it confirms that the lightness and hue angle increase
more or less linearly, the "colourfulness" goes up and down in waves, even
though you designed the chroma to increase linearly, too. I'm not sure
whether this is because "colourfulness" and "chroma" are actually two
different concepts, or whether it has to do with inaccuracies and/or
clamping during the conversion between various colour spaces. It could also
be the case that the colormath and pycam02ucs modules use different
conversion formulas (in which case it would be good to know which is "more
accurate"; not sure there is even an objective measure for "accuracy" in
this case). Also, there seems to be something strange going on at the dark
(blue) end of the colormap, but this could again be due to clamping.

I'd love to play a bit more with your example notebook but not sure I'll be
able to do so before the weekend (or early next week).

Cheers,
Max

Re: [matplotlib-devel] release strategy and the color revolution

[Michael W. <mw...@st...>]

Hey Olga,

On Tue, Feb 17, 2015 at 6:24 PM, Olga Botvinnik <obo...@uc...> wrote:

> Out of curiosity, what are the advantages of the HCL colormap over YlGnBu
> for continuous values? I'm biased towards YlGnBu because green is my
> favorite color and want to know what makes HCL objectively better for
> perceiving values.
>

Perceptually, the luminance ramp is probably a bit more linear, but that's
not a huge deal. The main functional advantage to using *some* kind of Hcl
based map is that it lets matplotlib tweak more parameters. This particular
Hcl map has a bit more hue variation than YlBuGn, and I think the
saturation channel is doing something different than what the colorbrewer
maps do. So it appears a little bit more "colorful", which I think was one
of the objectives.

I think there's some argument for matplotlib creating a novel colormap for
its default rather than just using one of the preset colorbrewer ones. It
would be nice to have a bit more well-defined visual identity, and having
people say "oh hey that's the matplotlib colormap, it looks really nice!"
might have good marketing benefits. I like the colorbrewer palettes and use
them often, but it seems kind of boring to take an existing colormap that
lots of packages have and make it the default.


> I added YlGnBu_r versions of those plots just below yours:
> http://nbviewer.ipython.org/gist/olgabot/6a619ef21c178801ff77
>
> It seems it's a little more "extreme" than HCL, as in it lights are
> lighter and its darks are darker. From the color research, is this less
> desirable?
>

Well, that could be changed in the Hcl version by setting different
endpoints for the lightness ramp. I was trying to get something similar to
parula, which doesn't cover as extreme of a lightness range and is more
saturated on both ends than the color brewer palettes. I would imagine the
reasoning for this is that it might let the map represent categorical or
divergent data a little bit better without much cost to sequential data,
but I am not sure.

Also, if you map a line or scatter plot with YlGnBu, the lightest colors
might not be visible on a white background, whereas I think the yellow I
used would be ok. This might be something to keep in mind as the map that
gets chosen will likely be the default for plt.scatter.

But like I said, I didn't spend much time thinking about exactly where the
endpoints should be, so it's possible one would want more dynamic luminance
range.

Michael


> On Mon Feb 16 2015 at 9:28:56 PM Benjamin Root <ben...@ou...> wrote:
>
>> Do remember that I have a PR to add linestyle cycling, which would
>> greatly mitigate problems for colorblindness and non-color publications.
>>
>> I also prefer it for slideshows as projectors at conferences tend to have
>> crappy colors anyway (was at a radar conference when the projector's red
>> crapped out while the presenter was building up suspense about the really,
>> really impressive radar image of a supercell on the next slide)
>>
>> Ben Root
>> On Feb 16, 2015 7:24 PM, "Michael Waskom" <mw...@st...> wrote:
>>
>>> See [here](http://nbviewer.ipython.org/gist/mwaskom/6a43a3b94eca4a9e2e8b)
>>> for a quick and dirty implementation that should get a general idea. This
>>> probably ins't the best way to do it -- anyone should feel free to build on
>>> this.
>>>
>>> On Mon, Feb 16, 2015 at 3:38 PM, Eric Firing <ef...@ha...> wrote:
>>>
>>>> On 2015/02/16 1:29 PM, Michael Waskom wrote:
>>>>
>>>>  Nathaniel's January 9 message in that thread (can't figure out how to
>>>>> link to it in the archives) had a suggestion that I thought was very
>>>>> promising, to do something similar to Parula but rotate around the hue
>>>>> circle the other direction so that the hues would go blue - purple -
>>>>> red
>>>>> - yellow. I don't think we've seen an example of exactly what it would
>>>>> look like, but I reckon it would be similar to the middle colormap here
>>>>> http://earthobservatory.nasa.gov/blogs/elegantfigures/
>>>>> files/2013/08/three_perceptual_palettes_618.png
>>>>> (from the elegant figures block series linked above), which I've always
>>>>> found quite attractive.
>>>>>
>>>>
>>>> Certainly it can be considered--but we have to have a real
>>>> implementation.
>>>>
>>>>
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
>>> from Actuate! Instantly Supercharge Your Business Reports and Dashboards
>>> with Interactivity, Sharing, Native Excel Exports, App Integration & more
>>> Get technology previously reserved for billion-dollar corporations, FREE
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>>> _______________________________________________
>>> Matplotlib-devel mailing list
>>> Mat...@li...
>>> https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
>>>
>>> ------------------------------------------------------------
>> ------------------
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>>
>

Re: [matplotlib-devel] release strategy and the color revolution

[Olga B. <obo...@uc...>]

Out of curiosity, what are the advantages of the HCL colormap over YlGnBu
for continuous values? I'm biased towards YlGnBu because green is my
favorite color and want to know what makes HCL objectively better for
perceiving values.

I added YlGnBu_r versions of those plots just below yours:
http://nbviewer.ipython.org/gist/olgabot/6a619ef21c178801ff77

It seems it's a little more "extreme" than HCL, as in it lights are lighter
and its darks are darker. From the color research, is this less desirable?

On Mon Feb 16 2015 at 9:28:56 PM Benjamin Root <ben...@ou...> wrote:

> Do remember that I have a PR to add linestyle cycling, which would greatly
> mitigate problems for colorblindness and non-color publications.
>
> I also prefer it for slideshows as projectors at conferences tend to have
> crappy colors anyway (was at a radar conference when the projector's red
> crapped out while the presenter was building up suspense about the really,
> really impressive radar image of a supercell on the next slide)
>
> Ben Root
> On Feb 16, 2015 7:24 PM, "Michael Waskom" <mw...@st...> wrote:
>
>> See [here](http://nbviewer.ipython.org/gist/mwaskom/6a43a3b94eca4a9e2e8b)
>> for a quick and dirty implementation that should get a general idea. This
>> probably ins't the best way to do it -- anyone should feel free to build on
>> this.
>>
>> On Mon, Feb 16, 2015 at 3:38 PM, Eric Firing <ef...@ha...> wrote:
>>
>>> On 2015/02/16 1:29 PM, Michael Waskom wrote:
>>>
>>>  Nathaniel's January 9 message in that thread (can't figure out how to
>>>> link to it in the archives) had a suggestion that I thought was very
>>>> promising, to do something similar to Parula but rotate around the hue
>>>> circle the other direction so that the hues would go blue - purple - red
>>>> - yellow. I don't think we've seen an example of exactly what it would
>>>> look like, but I reckon it would be similar to the middle colormap here
>>>> http://earthobservatory.nasa.gov/blogs/elegantfigures/
>>>> files/2013/08/three_perceptual_palettes_618.png
>>>> (from the elegant figures block series linked above), which I've always
>>>> found quite attractive.
>>>>
>>>
>>> Certainly it can be considered--but we have to have a real
>>> implementation.
>>>
>>>
>>
>>
>> ------------------------------------------------------------------------------
>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
>> from Actuate! Instantly Supercharge Your Business Reports and Dashboards
>> with Interactivity, Sharing, Native Excel Exports, App Integration & more
>> Get technology previously reserved for billion-dollar corporations, FREE
>>
>> http://pubads.g.doubleclick.net/gampad/clk?id=190641631&iu=/4140/ostg.clktrk
>> _______________________________________________
>> Matplotlib-devel mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
>>
>> ------------------------------------------------------------
> ------------------
> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
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> with Interactivity, Sharing, Native Excel Exports, App Integration & more
> Get technology previously reserved for billion-dollar corporations, FREE
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>

[matplotlib-devel] bad zooming performance on large dataset

[Neal B. <ndb...@gm...>]

I plotted a large number of bars on a bargraph.  I am not surprised memory usage 
and time to draw are bad on the initial view.  But I'd expect as I zoom in more 
and more, the time to draw should improve - there's less to draw.

This does not appear to be the case.

-- 
-- Those who don't understand recursion are doomed to repeat it

Re: [matplotlib-devel] matplotlib v1.4.3

[Nelle V. <nel...@gm...>]

Thanks again Thomas for the release !
Cheers,
N

On 17 February 2015 at 06:09, Thomas Caswell <tca...@gm...> wrote:
> Hello all,
>
> We are pleased to announce the release of matplotlib v1.4.3!
>
> Wheels, windows binaries and the source tarball are available through both
> source-forge [1]  and pypi (via pip).  Additionally the source is available
> tarball is available from github [2] and mac-wheels from
> http://wheels.scikit-image.org/.
>
> This is the last planned bug-fix release in the 1.4 series.
>
> Many bugs are fixed including:
>
> fixing drawing of edge-only markers in AGG
> fix run-away memory usage when using %inline or saving with a tight bounding
> box with QuadMesh artists
> improvements to wx and tk gui backends
>
> Additionally the webagg and nbagg backends were brought closer to
> feature parity with the desktop backends with the addition of keyboard
> and scroll events thanks to Steven Silvester.
>
> The next planned release will be based on the 1.4.x series but will change
> the default colors and be tagged as version v2.0. The target release date is
> in the next month or two.
>
> The next feature release will be v2.1 targeted for around SciPy in July.
>
> Tom
>
>
> [1]
> https://sourceforge.net/projects/matplotlib/files/matplotlib/matplotlib-1.4.3/
>
> [2] https://github.com/matplotlib/matplotlib/releases/tag/v1.4.3
>
>
>
> ------------------------------------------------------------------------------
> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
> from Actuate! Instantly Supercharge Your Business Reports and Dashboards
> with Interactivity, Sharing, Native Excel Exports, App Integration & more
> Get technology previously reserved for billion-dollar corporations, FREE
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Re: [matplotlib-devel] Release planning/milestones

[Todd <tod...@gm...>]

I wasn't referring to just the default colors, but the default style in
general. Things like background, line thickness, padding, ticks, etc. I
thought that there was agreement that the default matplotlib style is not
optimal,  and that the point of the 2.0 release was to put all the
stylistic changes in one release so people don't have to keep changing
their unit tests.

On Feb 8, 2015 11:04 PM, "Thomas Caswell" <tca...@gm...> wrote:
>
> To overhauling all of the default colors, I think that is still in the
cards, but some one who is not me needs to drive that.
>
> The goal of pulling pyplot out of backend_bases is exactly that, to be
able to do everything using the OO interface in a convenient way.
>
> Tom
>
> On Sun Feb 08 2015 at 4:50:51 PM Todd <tod...@gm...> wrote:
>>
>>
>> On Feb 8, 2015 1:13 AM, "Thomas Caswell" <tca...@gm...> wrote:
>> >
>> > Hey all,
>> >
>> > To start with, the 2.0 release is pending a choice of new default
color map.  I think that when we pick that we should cut 2.0 off of the
last release and then the next minor release turns into 2.1.  If we want to
do other breaking changes we will just do a 3.0 when that happens.  It
makes sense to me to bundle default color changes as one set of breaking
changes and code API changes as another.
>>
>> I thought there was going to be a complete overhaul of the default
theme?  Has that idea been abandoned?
>>
>> >  - making OO interface easier to use interactively (if interactive,
auto-redraw at sensible time)
>> >
>> >  - pull the pyplot state machine out of backend_bases and expose the
figure_manager classes
>>
>> Do either of these mean that it will be possible to use the OO interface
without needing to go through pyplot?
>>
>>
------------------------------------------------------------------------------
>>
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http://goparallel.sourceforge.net/_______________________________________________
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Re: [matplotlib-devel] release strategy and the color revolution

[Benjamin R. <ben...@ou...>]

Do remember that I have a PR to add linestyle cycling, which would greatly
mitigate problems for colorblindness and non-color publications.

I also prefer it for slideshows as projectors at conferences tend to have
crappy colors anyway (was at a radar conference when the projector's red
crapped out while the presenter was building up suspense about the really,
really impressive radar image of a supercell on the next slide)

Ben Root
On Feb 16, 2015 7:24 PM, "Michael Waskom" <mw...@st...> wrote:

> See [here](http://nbviewer.ipython.org/gist/mwaskom/6a43a3b94eca4a9e2e8b)
> for a quick and dirty implementation that should get a general idea. This
> probably ins't the best way to do it -- anyone should feel free to build on
> this.
>
> On Mon, Feb 16, 2015 at 3:38 PM, Eric Firing <ef...@ha...> wrote:
>
>> On 2015/02/16 1:29 PM, Michael Waskom wrote:
>>
>>  Nathaniel's January 9 message in that thread (can't figure out how to
>>> link to it in the archives) had a suggestion that I thought was very
>>> promising, to do something similar to Parula but rotate around the hue
>>> circle the other direction so that the hues would go blue - purple - red
>>> - yellow. I don't think we've seen an example of exactly what it would
>>> look like, but I reckon it would be similar to the middle colormap here
>>> http://earthobservatory.nasa.gov/blogs/elegantfigures/
>>> files/2013/08/three_perceptual_palettes_618.png
>>> (from the elegant figures block series linked above), which I've always
>>> found quite attractive.
>>>
>>
>> Certainly it can be considered--but we have to have a real implementation.
>>
>>
>
>
> ------------------------------------------------------------------------------
> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
> from Actuate! Instantly Supercharge Your Business Reports and Dashboards
> with Interactivity, Sharing, Native Excel Exports, App Integration & more
> Get technology previously reserved for billion-dollar corporations, FREE
>
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> _______________________________________________
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>
>

[matplotlib-devel] matplotlib v1.4.3

[Thomas C. <tca...@gm...>]

Hello all,

We are pleased to announce the release of matplotlib v1.4.3!

Wheels, windows binaries and the source tarball are available through both
source-forge [1]  and pypi (via pip).  Additionally the source is available
tarball is available from github [2] and mac-wheels from
http://wheels.scikit-image.org/.

This is the last planned bug-fix release in the 1.4 series.

Many bugs are fixed including:

   - fixing drawing of edge-only markers in AGG
   - fix run-away memory usage when using %inline or saving with a tight
   bounding box with QuadMesh artists
   - improvements to wx and tk gui backends

Additionally the webagg and nbagg backends were brought closer to
feature parity with the desktop backends with the addition of keyboard
and scroll events thanks to Steven Silvester.

The next planned release will be based on the 1.4.x series but will change
the default colors and be tagged as version v2.0. The target release date
is in the next month or two.

The next feature release will be v2.1 targeted for around SciPy in July.

Tom


[1]
https://sourceforge.net/projects/matplotlib/files/matplotlib/matplotlib-1.4.3/

[2] https://github.com/matplotlib/matplotlib/releases/tag/v1.4.3

Re: [matplotlib-devel] release strategy and the color revolution

[Michael W. <mw...@st...>]

See [here](http://nbviewer.ipython.org/gist/mwaskom/6a43a3b94eca4a9e2e8b)
for a quick and dirty implementation that should get a general idea. This
probably ins't the best way to do it -- anyone should feel free to build on
this.

On Mon, Feb 16, 2015 at 3:38 PM, Eric Firing <ef...@ha...> wrote:

> On 2015/02/16 1:29 PM, Michael Waskom wrote:
>
>  Nathaniel's January 9 message in that thread (can't figure out how to
>> link to it in the archives) had a suggestion that I thought was very
>> promising, to do something similar to Parula but rotate around the hue
>> circle the other direction so that the hues would go blue - purple - red
>> - yellow. I don't think we've seen an example of exactly what it would
>> look like, but I reckon it would be similar to the middle colormap here
>> http://earthobservatory.nasa.gov/blogs/elegantfigures/
>> files/2013/08/three_perceptual_palettes_618.png
>> (from the elegant figures block series linked above), which I've always
>> found quite attractive.
>>
>
> Certainly it can be considered--but we have to have a real implementation.
>
>

Re: [matplotlib-devel] release strategy and the color revolution

[Michael W. <mw...@st...>]

It's helped by pulling the green towards blue and the red towards yellow,
but they are probably the hardest to distinguish in the set.

Which emphasizes that, while it's good to start with a colorblind-friendly
set of colors, the person making the figure also has the responsibility to
choose how to use those colors carefully so that the categories that are
most important to distinguish aren't colored with red and green.

On Mon, Feb 16, 2015 at 3:32 PM, Eric Firing <ef...@ha...> wrote:

> On 2015/02/16 1:19 PM, Michael Waskom wrote:
>
>> Here are two palettes that are optimized for colorblindness:
>> http://www.cookbook-r.com/Graphs/Colors_%28ggplot2%29/#
>> a-colorblind-friendly-palette
>>
>>
> Strange--they have both red and green, so I would never have expected them
> to work.  The yellow looks too light to work well on a light background,
> especially for projecting slides.
>
> Eric
>

Re: [matplotlib-devel] release strategy and the color revolution

[Eric F. <ef...@ha...>]

On 2015/02/16 1:29 PM, Michael Waskom wrote:

> Nathaniel's January 9 message in that thread (can't figure out how to
> link to it in the archives) had a suggestion that I thought was very
> promising, to do something similar to Parula but rotate around the hue
> circle the other direction so that the hues would go blue - purple - red
> - yellow. I don't think we've seen an example of exactly what it would
> look like, but I reckon it would be similar to the middle colormap here
> http://earthobservatory.nasa.gov/blogs/elegantfigures/files/2013/08/three_perceptual_palettes_618.png
> (from the elegant figures block series linked above), which I've always
> found quite attractive.

Certainly it can be considered--but we have to have a real implementation.

Re: [matplotlib-devel] release strategy and the color revolution

[Eric F. <ef...@ha...>]

On 2015/02/16 1:19 PM, Michael Waskom wrote:
> Here are two palettes that are optimized for colorblindness:
> http://www.cookbook-r.com/Graphs/Colors_%28ggplot2%29/#a-colorblind-friendly-palette
>

Strange--they have both red and green, so I would never have expected 
them to work.  The yellow looks too light to work well on a light 
background, especially for projecting slides.

Eric

Re: [matplotlib-devel] release strategy and the color revolution

[Michael W. <mw...@st...>]

On Mon, Feb 16, 2015 at 2:01 PM, Eric Firing <ef...@ha...> wrote:


>
> Here is what I think is the most recent extensive thread:
> http://comments.gmane.org/gmane.comp.python.matplotlib.devel/13122

...


> 1) A greyscale has been proposed; it satisfies several of the criteria
> very well, but misses by omitting hue entirely.  It is proposed as a way
> to force users to choose something other than the default; I don't think
> this is a good *competitive* strategy.
>
> 2) YlGnBu or YlGnBu_r seems to me to be a viable candidate.  It has the
> great advantage that we already have it.  It seems to rate well by most
> of the criteria illustrated via Nathaniel's
> https://github.com/njsmith/pycam02ucs viscm() tool. (Perceptual distance
> is a little jumpy.)
>


> Others?
>

Nathaniel's January 9 message in that thread (can't figure out how to link
to it in the archives) had a suggestion that I thought was very promising,
to do something similar to Parula but rotate around the hue circle the
other direction so that the hues would go blue - purple - red - yellow. I
don't think we've seen an example of exactly what it would look like, but I
reckon it would be similar to the middle colormap here
http://earthobservatory.nasa.gov/blogs/elegantfigures/files/2013/08/three_perceptual_palettes_618.png
(from the elegant figures block series linked above), which I've always
found quite attractive.

Re: [matplotlib-devel] release strategy and the color revolution

[Michael W. <mw...@st...>]

On Mon, Feb 16, 2015 at 3:19 PM, Michael Waskom <mw...@st...>
wrote:

> Here are two palettes that are optimized for colorblindness


actually I should say I have no idea if those are optimal, but the
simulations do suggest they work well.

Re: [matplotlib-devel] release strategy and the color revolution

[Michael W. <mw...@st...>]

On Mon, Feb 16, 2015 at 3:15 PM, Eric Firing <ef...@ha...> wrote:

> Does anyone have a suggestion for a colorblind-friendly cycle?  Maybe
> omit the green and tack a gray on the end?  I haven't checked, so I
> don't know if this would work well.
>

Here are two palettes that are optimized for colorblindness:
http://www.cookbook-r.com/Graphs/Colors_%28ggplot2%29/#a-colorblind-friendly-palette

Seaborn has a `colorblind` palette that is somewhere between these colors
and the standard matplotlib/seaborn set. It's intended to be a little
better than deep (which actually isn't too bad in terms of red vs green),
but it's not been extensively tested or optimized.


> It is common to have plots with two curves, and the present blue, green
> pair is not very high-contrast; having the first two colors be blue and
> red would be better, I think.
>

+1

Re: [matplotlib-devel] release strategy and the color revolution

[Eric F. <ef...@ha...>]

On 2015/02/16 12:42 PM, Paul Hobson wrote:
> There are several cycles in seaborn. Is it safe to assume that you mean
> the 'deep' palette?

Yes, in the sense that when I wrote the message I was just looking at 
seaborn's tutorial showing the default, which is 'deep'--but I didn't 
know it then.

A good case could be made for "dark"; it has better contrast among all 
the colors.  It might be better than "deep" for line plots, especially 
when the lines are thin.

The main point was to get at least one plausible choice on the table.

Does anyone have a suggestion for a colorblind-friendly cycle?  Maybe 
omit the green and tack a gray on the end?  I haven't checked, so I 
don't know if this would work well.

It is common to have plots with two curves, and the present blue, green 
pair is not very high-contrast; having the first two colors be blue and 
red would be better, I think.

Eric

> On Mon, Feb 16, 2015 at 14:40 Eric Firing <ef...@ha...
> <mailto:ef...@ha...>> wrote:
>
>     On 2015/02/16 12:01 PM, Eric Firing wrote:
>
>      >
>      > Proposals for the new color cycle for line plots?
>
>     Here is a proposal: we simply adopt seaborn's cycle.
>
>     Eric

Re: [matplotlib-devel] release strategy and the color revolution

[Paul H. <pmh...@gm...>]

There are several cycles in seaborn. Is it safe to assume that you mean the
'deep' palette?
On Mon, Feb 16, 2015 at 14:40 Eric Firing <ef...@ha...> wrote:

> On 2015/02/16 12:01 PM, Eric Firing wrote:
>
> >
> > Proposals for the new color cycle for line plots?
>
> Here is a proposal: we simply adopt seaborn's cycle.
>
> Eric
>
>
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Re: [matplotlib-devel] release strategy and the color revolution

[Eric F. <ef...@ha...>]

On 2015/02/16 12:01 PM, Eric Firing wrote:

>
> Proposals for the new color cycle for line plots?

Here is a proposal: we simply adopt seaborn's cycle.

Eric

[matplotlib-devel] release strategy and the color revolution

[Eric F. <ef...@ha...>]

For a long time there has been discussion of replacing the matplotlib 
default color map and color cycle, but we still haven't done it. We need 
a clear set of criteria, and a small set of good alternatives, leading 
to a decision, a PR, and a release.  Now is the time.

Here is what I think is the most recent extensive thread:
http://comments.gmane.org/gmane.comp.python.matplotlib.devel/13122

Early in that thread Nathaniel Smith proposed the following criteria:

- sequential, not diverging
- perceptually uniform
- still perceptually uniform when converted to greyscale
- variation in hue is good
- colorblind-friendly
- hue ramp should work even without the luminance variation

I added:
- aesthetically pleasing

Probably not all of these can be met perfectly at once, but they seem 
like good goals.  The one most likely to be controversial is the first. 
  I propose that we not bother arguing about it, but just accept 
Nathaniel's recommendation.

For actual proposals:

1) A greyscale has been proposed; it satisfies several of the criteria 
very well, but misses by omitting hue entirely.  It is proposed as a way 
to force users to choose something other than the default; I don't think 
this is a good *competitive* strategy.

2) YlGnBu or YlGnBu_r seems to me to be a viable candidate.  It has the 
great advantage that we already have it.  It seems to rate well by most 
of the criteria illustrated via Nathaniel's 
https://github.com/njsmith/pycam02ucs viscm() tool. (Perceptual distance 
is a little jumpy.)

Others?

Proposals for the new color cycle for line plots?

Proposed release strategy:
We will close the 1.4.x line with 1.4.3, in the process of being 
released now.
The next step is the color change release, 2.0, based on 1.4.3, but with 
any additional bug fixes and other reasonably non-risky changes that are 
ready to go.
Any substantial new features will then go in a subsequent point release.

Eric

Re: [matplotlib-devel] [Matplotlib-users] Capitalization of Matplotlib

[Matthew B. <mat...@gm...>]

Hi,

On Mon, Feb 16, 2015 at 1:26 PM, Paul Kuin <np...@gm...> wrote:
> Ah, since it is a proper name it should be capitalised, but it never was.  I
> think that it should remain uncapitalised and that you want to propose an
> alternative, like a change in type for the proper name matplotlib. Could be
> typescript, or something else.

I'm guessing the type-setters would object to always using typewriter
(or other special) font for matplotlib, as it would quickly get tiring
on the eye.

Cheers,

Matthew

Re: [matplotlib-devel] Capitalization of Matplotlib

[Thomas K. <th...@kl...>]

On 16 February 2015 at 10:53, Nelle Varoquaux <nel...@gm...>
wrote:

> 2. you are used to having sentences start with capital letter, but
> this is mostly cultural. German People capitalize almost all Words in
> a Sentence. It just looks weird too…
>

FWIW, I tried naming a few small projects with all-lowercase names, and I
find it really hard to not capitalise them at the start of a sentence. It
looks far more wrong to me than capitalised Nouns in the middle of a
sentence. You may say this is specific to English, but most documentation
is going to be written in English.

My experience with IPython (aka "iPython") suggests that no-one outside the
project actually cares or even remembers how you capitalise your project
name. ;-)

Thomas

Re: [matplotlib-devel] Capitalization of Matplotlib

[Paul H. <pmh...@gm...>]

Perhaps this is a bit a of tangent, but what is exactly is the distinction
between the project and the software?

Is it as simple as: software = code and project = code + mailing list +
documentation + managing issues on github?

On Mon, Feb 16, 2015 at 11:04 AM, Matthew Brett <mat...@gm...>
wrote:

> Hi,
>
> On Mon, Feb 16, 2015 at 10:53 AM, Nelle Varoquaux
> <nel...@gm...> wrote:
> >>>>>
> >>>>> IMO, never.
> >>>>
> >>>>
> >>>> Rationale, please?
> >>>
> >>>
> >>> Consistency: it is never capitalized in matplotlib's documentation.
> >>
> >>
> >> True, and a valid point--but we could easily change that.  Wouldn't it
> make
> >> it bit more readable if sentences always started with a capital letter?
> >> Starting with lower case just looks wrong and artificial.
> >
> > I'm going to give two bad reasons to keep it this way:
> > 1. backward compatibility :p
> > 2. you are used to having sentences start with capital letter, but
> > this is mostly cultural. German People capitalize almost all Words in
> > a Sentence. It just looks weird too… (There is the other extreme:
> > people who don't seem to know where the shift button on their keyboard
> > is when writing an email.)
> >
> > I'm actually fine with changing it, but I think we should try as much
> > as possible to be consistent.
>
> I suppose everyone would agree that <pre>matplotlib</pre> should never
> be capitalized.  I guess also that your (Ben's) typsetters will not
> often be using <pre></pre> formatted matplotlib.  In that case I would
> say Matplotlib is a English proper noun and standard capitalization
> rules apply.   It would probably be confusing to try and distinguish
> between the project and the software with capitalization.
>
> Does it matter that the book and the mpl documentation have a
> different convention?
>
> Cheers,
>
> Matthew
>
>
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Re: [matplotlib-devel] Capitalization of Matplotlib

[Matthew B. <mat...@gm...>]

Hi,

On Mon, Feb 16, 2015 at 10:53 AM, Nelle Varoquaux
<nel...@gm...> wrote:
>>>>>
>>>>> IMO, never.
>>>>
>>>>
>>>> Rationale, please?
>>>
>>>
>>> Consistency: it is never capitalized in matplotlib's documentation.
>>
>>
>> True, and a valid point--but we could easily change that.  Wouldn't it make
>> it bit more readable if sentences always started with a capital letter?
>> Starting with lower case just looks wrong and artificial.
>
> I'm going to give two bad reasons to keep it this way:
> 1. backward compatibility :p
> 2. you are used to having sentences start with capital letter, but
> this is mostly cultural. German People capitalize almost all Words in
> a Sentence. It just looks weird too… (There is the other extreme:
> people who don't seem to know where the shift button on their keyboard
> is when writing an email.)
>
> I'm actually fine with changing it, but I think we should try as much
> as possible to be consistent.

I suppose everyone would agree that <pre>matplotlib</pre> should never
be capitalized.  I guess also that your (Ben's) typsetters will not
often be using <pre></pre> formatted matplotlib.  In that case I would
say Matplotlib is a English proper noun and standard capitalization
rules apply.   It would probably be confusing to try and distinguish
between the project and the software with capitalization.

Does it matter that the book and the mpl documentation have a
different convention?

Cheers,

Matthew