[Paraview] obtaining the color MAP transfer function

Fri Apr 13 04:38:09 EDT 2018

Dear Andrei,

Yes, the "Resample To Image" Filter is dedicated to this task. It will
allow convert you Unstructured Grid to a regular Image Data and allow you
to save your data as a .vti file.

Best,

Mathieu Westphal

On Fri, Apr 13, 2018 at 10:35 AM, Andrei Cimpoeru <
andrei.cimpoeru at cfms.org.uk> wrote:

> 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
>>>>>>>>
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>>>>>>>>
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>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> *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:
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>>>
>>>
>>
>
>
> --
> *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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