[Paraview] obtaining the color MAP transfer function

Fri Apr 13 04:35:16 EDT 2018

Dear Mathiew/David,

Thanks a lot for you guidance. That was very helpful.
I have seen that you also support VTI. I had a look at the structure of the
format and it seems that this is a structured/rectilinear grid. The data
that I am woking with right now is unstructured .pvd.
Is there are way in Paraview to project/sample my unstructured dataset to a
rectiliniar/structured grid so then I can export it to .VTI format?

Many thanks and I am looking forward to hear from you.

Best,

Andrei

On Thu, Apr 12, 2018 at 4:22 PM, David E DeMarle <dave.demarle at kitware.com>
wrote:

> You can export to cinema to get rendered images for which the data at each
> pixel in the image is a floating point value not a color.
>
> David E DeMarle
> Kitware, Inc.
> Principal Engineer
> 21 Corporate Drive
> <https://maps.google.com/?q=21+Corporate+Drive+Clifton+Park,+NY+12065&entry=gmail&source=g>
> Clifton Park, NY 12065
> <https://maps.google.com/?q=21+Corporate+Drive+Clifton+Park,+NY+12065&entry=gmail&source=g>
> -8662
> Phone: 518-881-4909
>
> On Thu, Apr 12, 2018 at 11:13 AM, Mathieu Westphal <
> mathieu.westphal at kitware.com> wrote:
>
>> Hello
>>
>> Please keep the ML in the cc so everyone can provide.
>>
>> You should be able to do that in the python shell.
>>
>> Views->Python Shell
>>
>> s = GetActiveSource()
>> r=Show(s)
>> l=r.LookupTable
>> l.RGBPoints
>>
>>
>> Best,
>>
>> Mathieu Westphal
>>
>> On Thu, Apr 12, 2018 at 3:14 PM, Andrei Cimpoeru <
>> andrei.cimpoeru at cfms.org.uk> wrote:
>>
>>> Dear Mathieu,
>>>
>>> Please see the attached picture. I think that I can see a way to get
>>> back to the original data. Is there a change to access the table with the *Color
>>> Transfer Function Values?*
>>>
>>> Cheers,
>>>
>>> Andrei
>>>
>>> On Thu, Apr 12, 2018 at 2:10 PM, Mathieu Westphal <
>>> mathieu.westphal at kitware.com> wrote:
>>>
>>>> Dear Andrei
>>>>
>>>> There is no way to guess the pressure values with only the RGB data.
>>>> One can only guess the range and the color map used for generating the
>>>> image.
>>>> You will need to find the original data.
>>>>
>>>> Best,
>>>>
>>>> Mathieu Westphal
>>>>
>>>> On Thu, Apr 12, 2018 at 2:59 PM, Andrei Cimpoeru <
>>>> andrei.cimpoeru at cfms.org.uk> wrote:
>>>>
>>>>>
>>>>> Hi Mathieu,
>>>>>
>>>>> Thanks for getting back to me. Let's say that I have the image below
>>>>> (attached). If you load it in Paraview  you have a vector field of PNG
>>>>> consisting of RGB values. How do I turn these values back to pressure.
>>>>> I am interested in this because I want to map the RGB colors back to
>>>>> pressure field. Is there any way to this using vtk-python?
>>>>>
>>>>> Cheers,
>>>>>
>>>>> Andrei
>>>>>
>>>>>
>>>>>
>>>>> On Thu, Apr 12, 2018 at 12:00 PM, Mathieu Westphal <
>>>>> mathieu.westphal at kitware.com> wrote:
>>>>>
>>>>>> Dear Andrei,
>>>>>>
>>>>>> I'm not sure to follow what your are trying to achieve. Please
>>>>>> explain again.
>>>>>>
>>>>>> In any case, the mapping between the pressure and the RGB values you
>>>>>> see in paraview is controlled by
>>>>>> the Color Map Editor and the range of the data. All these tools are
>>>>>> accessible in the Toolbar visible in the attached image, I've highligthed
>>>>>> the Color Editor button.
>>>>>>
>>>>>> Best regards,
>>>>>>
>>>>>>
>>>>>> Mathieu Westphal
>>>>>>
>>>>>> On Thu, Apr 12, 2018 at 12:28 PM, Andrei Cimpoeru <
>>>>>> andrei.cimpoeru at cfms.org.uk> wrote:
>>>>>>
>>>>>>> Hi ,
>>>>>>>
>>>>>>> I am currently working with Paraview  and deep learning models. I
>>>>>>> have created a set of images (.png) using Paraview. The images are related
>>>>>>> to the pressure field around a wing. When I load images back to Paraview
>>>>>>> all I can visualise are the RGB  values.
>>>>>>> *When the image are exported from Paraview the pressure field is
>>>>>>> transferred into RGB values. Is there a way to obtain the function that
>>>>>>> does that?*
>>>>>>> Instead of exporting to .png a data format that I like is the .vti.
>>>>>>> This format keep the current information about pressure, velocity, mach
>>>>>>> number etc. Is there something that I could export a slice  to .vti?
>>>>>>>
>>>>>>>  Many thanks and I am looking forward to hear from you.
>>>>>>>
>>>>>>> Cheers,
>>>>>>>
>>>>>>> Andrei
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> *Andrei Cimpoeru* // CFD Engineer
>>>>>>>
>>>>>>>
>>>>>>> <https://cfms.org.uk/news-events/events/2018/july/farnborough-international-airshow-2018/>
>>>>>>>
>>>>>>> *e: *andrei.cimpoeru at cfms.org.uk   *t*: 0117 906 1106   *w: *
>>>>>>> www.cfms.org.uk
>>>>>>> CFMS Services Ltd // Bristol & Bath Science Park // Dirac Crescent
>>>>>>> // Emersons Green // Bristol // BS16 7FR
>>>>>>>
>>>>>>> CFMS Services Ltd is registered in England and Wales No 05742022 - a
>>>>>>> subsidiary of CFMS Ltd
>>>>>>> CFMS Services Ltd registered office // 43 Queens Square // Bristol
>>>>>>> // BS1 4QP
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Powered by www.kitware.com
>>>>>>>
>>>>>>> Visit other Kitware open-source projects at
>>>>>>> http://www.kitware.com/opensource/opensource.html
>>>>>>>
>>>>>>> Please keep messages on-topic and check the ParaView Wiki at:
>>>>>>> http://paraview.org/Wiki/ParaView
>>>>>>>
>>>>>>> Search the list archives at: http://markmail.org/search/?q=ParaView
>>>>>>>
>>>>>>> Follow this link to subscribe/unsubscribe:
>>>>>>> https://public.kitware.com/mailman/listinfo/paraview
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> *Andrei Cimpoeru* // CFD Engineer
>>>>>
>>>>>
>>>>> <https://cfms.org.uk/news-events/events/2018/july/farnborough-international-airshow-2018/>
>>>>>
>>>>> *e: *andrei.cimpoeru at cfms.org.uk   *t*: 0117 906 1106   *w: *
>>>>> www.cfms.org.uk
>>>>> CFMS Services Ltd // Bristol & Bath Science Park // Dirac Crescent // Emersons
>>>>> Green // Bristol // BS16 7FR
>>>>>
>>>>> CFMS Services Ltd is registered in England and Wales No 05742022 - a
>>>>> subsidiary of CFMS Ltd
>>>>> CFMS Services Ltd registered office // 43 Queens Square // Bristol //
>>>>> BS1 4QP
>>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> *Andrei Cimpoeru* // CFD Engineer
>>>
>>>
>>> <https://cfms.org.uk/news-events/events/2018/july/farnborough-international-airshow-2018/>
>>>
>>> *e: *andrei.cimpoeru at cfms.org.uk   *t*: 0117 906 1106   *w: *
>>> www.cfms.org.uk
>>> CFMS Services Ltd // Bristol & Bath Science Park // Dirac Crescent // Emersons
>>> Green // Bristol // BS16 7FR
>>>
>>> CFMS Services Ltd is registered in England and Wales No 05742022 - a
>>> subsidiary of CFMS Ltd
>>> CFMS Services Ltd registered office // 43 Queens Square // Bristol //
>>> BS1 4QP
>>>
>>
>>
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the ParaView Wiki at:
>> http://paraview.org/Wiki/ParaView
>>
>> Search the list archives at: http://markmail.org/search/?q=ParaView
>>
>> Follow this link to subscribe/unsubscribe:
>> https://public.kitware.com/mailman/listinfo/paraview
>>
>>
>

-- 
*Andrei Cimpoeru* // CFD Engineer

<https://cfms.org.uk/news-events/events/2018/july/farnborough-international-airshow-2018/>

*e: *andrei.cimpoeru at cfms.org.uk   *t*: 0117 906 1106   *w: *www.cfms.org.uk

CFMS Services Ltd // Bristol & Bath Science Park // Dirac Crescent // Emersons
Green // Bristol // BS16 7FR

CFMS Services Ltd is registered in England and Wales No 05742022 - a
subsidiary of CFMS Ltd
CFMS Services Ltd registered office // 43 Queens Square // Bristol // BS1
4QP
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