[Paraview] Making a certain color in an image transparent

[David Pont]

David,
  I'm pretty sure I got TIFF files to display with transparency a while back. The files were RGBA, ie included an alpha channel and I had masked out a background. Can you pre-process your images and add an alpha channel with 0 where you want transparency? You should be able to find or make a test image pretty fast to see if it works.

  regards, Dave


-----Original Message-----
From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org] On Behalf Of Utkarsh Ayachit
Sent: Tuesday, 9 November 2010 8:34 a.m.
To: David Doria
Cc: ParaView
Subject: Re: [Paraview] Making a certain color in an image transparent

Nope, it's not currently possible with ParaView.

On Mon, Nov 8, 2010 at 2:19 PM, David Doria <daviddoria at gmail.com> wrote:
> I want to make one color of an image (a traditional 2D image) totally
> transparent and leave the rest in tact. I have some mask files (white
> and green pixels) and I want only the green pixels to be displayed in
> ParaView. The white pixels should be transparent so I can see the
> original image in that region (when I also have it opened in
> ParaView).
>
> I can do it in VTK using vtkImageMapToColors with a vtkLookupTable
> (http://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/Transparency) but is
> it possible in ParaView?
>
> Thanks,
>
> David
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