[Paraview] obtaining the color MAP transfer function

[Mathieu Westphal]

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
>>>>>
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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
>
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