[Paraview] obtaining the color MAP transfer function

Thu Apr 12 11:22:27 EDT 2018

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
Clifton Park, NY 12065-8662
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/opensou
> rce/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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://public.kitware.com/pipermail/paraview/attachments/20180412/c6424886/attachment.html>