[Matplotlib-users] Trying to reproduce plot with a certain colormap

kgb2020 kgb2020 at protonmail.ch
Fri Aug 11 18:06:51 EDT 2017


Hi,

Thanks for the replies. I use MATLAB so I am familiar with jet; but the colors in my colleague's plot looked too "pastelized" that I had my doubts, and finally decided to ask.

Best, Kris

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> -------- Original Message --------
> Subject: Re: [Matplotlib-users] Trying to reproduce plot with a certain colormap
> Local Time: August 12, 2017 4:02 AM
> UTC Time: August 11, 2017 8:02 PM
> From: ben.v.root at gmail.com
> To: Jody Klymak <jklymak at uvic.ca>
> Matplotlib-users <matplotlib-users at python.org>, kgb2020 <kgb2020 at protonmail.ch>
>
> The CMYK converted jet still has a bright yellow in there that is not in the one showed by Kris at all.
>
> On Fri, Aug 11, 2017 at 3:53 PM, Jody Klymak <jklymak at uvic.ca> wrote:
>
>> On 11 Aug 2017, at 12:17, Klymak Jody wrote:
>>
>>> This image has pretty clearly been converted to CMYK hence the dullness. Pretty convinced that's what jet looks like after a CMYK conversion.
>>
>> See:
>>
>> https://gist.github.com/jklymak/744db8cc538e5757ecc4eb4977bff3a3
>>
>> CMYK conversion was done in Illustrator.
>>
>> You could still argue that matplotlib’s “jet” gets darker at the high reds and low blues, and maybe the cyan is more bright. But you have to be pretty careful w/ CMYK conversions because it depends on the profiles used etc etc. I’d buy the argument that this is a matlab jet versus a matplotlib jet, but I think most of the perceived difference is because a CMYK conversion happened somewhere along the way.
>>
>> Cheers, Jody
>>
>> PS, I note the image says that it is RGB, but then my converted image also says the same thing.
>>
>>> Cheers. Jody
>>>
>>> Sent from my iPhone
>>>
>>>> On Aug 11, 2017, at 11:51, "vincent.adrien at gmail.com" <vincent.adrien at gmail.com> wrote:
>>>>
>>>> Hi all,
>>>>
>>>> I agree with Ben that it does not look like jet to me: the bright light blue seems to be missing. FWIW, "Spectral" (with a capital S) might be the closest colormap among the built-in ones in Matplotlib, but it is still more “pastel-ish” than Kris´ example.
>>>>
>>>> Best,
>>>> Adrien
>>>>
>>>>> On 08/11/2017 11:43 AM, Benjamin Root wrote:
>>>>> Not jet, it doesn't go through cyan. Looks more like coolwarm, to me, or maybe RdYlGn_r (but the yellow isn't right, either...).
>>>>> I am also not completely convinced it was made in matplotlib. The 3d plot's projection isn't the same as mplot3d's projection.
>>>>> On Fri, Aug 11, 2017 at 2:34 PM, Jody Klymak <jklymak at uvic.ca <mailto:jklymak at uvic.ca>> wrote:
>>>>> __
>>>>> Hi Kris,
>>>>> That one is called “jet”, though it looks like she applied a bit of
>>>>> a normalization to it to move the (green) center to lower values…
>>>>> https://matplotlib.org/users/colormapnorms.html
>>>>> <https://matplotlib.org/users/colormapnorms.html> (see the last
>>>>> subsection: “Two linear ranges”)
>>>>> Cheers, Jody
>>>>> On 11 Aug 2017, at 11:25, kgb2020 via Matplotlib-users wrote:
>>>>> Hello everybody,
>>>>> I have this figure done by a colleague quite a while ago in
>>>>> matplotlib:
>>>>> https://image.ibb.co/cxGKSF/tst0.png
>>>>> <https://image.ibb.co/cxGKSF/tst0.png>
>>>>> Unfortunately, I no longer have contact with my colleague to ask
>>>>> the particular colormap she used in matplotlib. I have looked
>>>>> through the gallery at
>>>>> https://matplotlib.org/examples/color/colormaps_reference.html
>>>>> <https://matplotlib.org/examples/color/colormaps_reference.html> but
>>>>> I am unable to find that colormap she used there.
>>>>> Can anybody recognize the colormap she used in that plot?
>>>>> Thank you!
>>>>> Best, Kris
>>>>> Sent with ProtonMail <https://protonmail.com> Secure Email.
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