# Get List of color transfer functions
**URL:** https://discourse.paraview.org/t/get-list-of-color-transfer-functions/3194
**Category:** ParaView Support
**Created:** [December 17, 2019, 10:34am UTC](https://discourse.paraview.org/t/get-list-of-color-transfer-functions/3194 "2019-12-17T10:34:50Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@bastian](https://discourse.paraview.org/u/bastian)
#### Post date: [December 17, 2019, 10:34am UTC](https://discourse.paraview.org/t/get-list-of-color-transfer-functions/3194/1 "2019-12-17T10:34:50Z")
I need to obtain a list of active color transfer functions, but I can’t figure out how to.
Here is a minimum code that visualizes a variable named ‘Swirl’:
```
# trace generated using paraview version 5.7.0-RC2
from paraview.simple import *
renderView1 = GetActiveViewOrCreate('RenderView')
renderView1.Update()
fastUniformGrid1 = FastUniformGrid()
fastUniformGrid1Display = Show(fastUniformGrid1, renderView1)
ColorBy(fastUniformGrid1Display, ('POINTS', 'Swirl', 'Magnitude'))
fastUniformGrid1Display.RescaleTransferFunctionToDataRange(True, False)
fastUniformGrid1Display.SetScalarBarVisibility(renderView1, True)
swirlLUT = GetColorTransferFunction('Swirl')
swirlPWF = GetOpacityTransferFunction('Swirl')
fastUniformGrid1Display.SetRepresentationType('Surface')
```
What I need is a function like `GetColorTransferFunctions`:
```
ListOfLUTs = GetColorTransferFunctions() # = [GetColorTransferFunction('Swirl')] in the above example
```
Or, alternatively, a function that provides the names of variables for which there is a LUT:
```
ListOfVariableNames = GetVariableNames( withLUT=True ) # = ['Swirl'] in the above example
```
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [December 17, 2019, 11:01am UTC](https://discourse.paraview.org/t/get-list-of-color-transfer-functions/3194/2 "2019-12-17T11:01:35Z")
This is not exposed. You can implement it using vtkSMSessionProxyManager::GetProxies
---
### Author:  [@bastian](https://discourse.paraview.org/u/bastian)
#### Post date: [December 17, 2019, 12:17pm UTC](https://discourse.paraview.org/t/get-list-of-color-transfer-functions/3194/3 "2019-12-17T12:17:30Z")
I’m not familiar with the `vtkSMSessionProxyManager` thing. Is it available in a python script that I would run in the shell or via `pvbatch`/`pvpython`?
---
### Author:  [@bastian](https://discourse.paraview.org/u/bastian)
#### Post date: [December 17, 2019, 1:00pm UTC](https://discourse.paraview.org/t/get-list-of-color-transfer-functions/3194/4 "2019-12-17T13:00:00Z")
@mwestphal, there is
```auto
servermanager.ProxyManager().GetProxies(groupname=?, proxyname=?)
```
but what are the arguments needed to obtain the names of the LUTs?
mmmh, `proxyname='LookupTable'` ? […](https://kitware.github.io/paraview-docs/latest/cxx/classvtkSMSessionProxyManager.html#a6006f8be4f2cf5ce588e47146ee24f02)
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [December 17, 2019, 1:56pm UTC](https://discourse.paraview.org/t/get-list-of-color-transfer-functions/3194/5 "2019-12-17T13:56:34Z")
`servermanager.ProxyManager().GetProxies("lookup_tables", "PVLookupTable")` should do the trick.
---
### Author:  [@bastian](https://discourse.paraview.org/u/bastian)
#### Post date: [December 19, 2019, 8:12am UTC](https://discourse.paraview.org/t/get-list-of-color-transfer-functions/3194/6 "2019-12-19T08:12:07Z")
it returns an empty list
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [December 19, 2019, 9:22am UTC](https://discourse.paraview.org/t/get-list-of-color-transfer-functions/3194/7 "2019-12-19T09:22:46Z")
My bad, there is no direct way to do that. You can do it this way :
```
proxyList = []
nProxies = servermanager.ProxyManager().GetNumberOfProxies('lookup_tables')
for i in range(nProxies):
proxyName = servermanager.ProxyManager().GetProxyName('lookup_tables', i)
proxyList.add(servermanager.ProxyManager().GetProxy('lookup_tables', proxyName))
```