[Paraview] obtaining the color MAP transfer function

Fri Apr 13 06:04:40 EDT 2018

Mathieu,

Thanks a lot. When I load your .pvsm Paraview 5.4.1 crashes .Could you
export the state as .py instead of .pvsm?

Thanks a lot

On Fri, Apr 13, 2018 at 10:56 AM, Mathieu Westphal <
mathieu.westphal at kitware.com> wrote:

> Andrei,
>
> I'm able to generate valid results with the attached state file (use
> File->Load State to test it)
> Make sure to set the Sampling Dimensions correctly.
>
> Best,
>
> Mathieu Westphal
>
> On Fri, Apr 13, 2018 at 11:44 AM, Andrei Cimpoeru <
> andrei.cimpoeru at cfms.org.uk> wrote:
>
>> Mathiew,
>>
>>
>> Thanks a lot. That was very helpful.
>> However when I use Resample to Image Filter it looks like my information
>> is lost. I have attached the dataset so you can have a look.
>>
>> Best,
>>
>> Andrei
>>
>>
>> On Fri, Apr 13, 2018 at 9:38 AM, Mathieu Westphal <
>> mathieu.westphal at kitware.com> wrote:
>>
>>> 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
>>>>>>>>>>>
>>>>>>>>>>> Search the list archives at: http://markmail.org/search/?q=
>>>>>>>>>>> ParaView
>>>>>>>>>>>
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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:
>>>>>> 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
>>
>
>

-- 
*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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