[vtkusers] Set Different Opacity Value to Different GrayScale to DisplayImage

[Hongsongyang]

David,
     Thank you very much for your example.
Actually, the example you list could not meet my requirement at all.

If I set the background as Green, if the opacity value is 0 of some pixel.
I want this pixel displayed as background color, but not the white color at
all.

I want to know if there is a way to implement real opacity mechanism but not
the mask mechanism.

Thank you very much.
Best regards,

Hongsongyang




 

> -----Original Message-----
> From: David Doria [mailto:daviddoria at gmail.com] 
> Sent: Monday, June 03, 2013 7:49 PM
> To: Hongsongyang
> Cc: vtkusers at vtk.org
> Subject: Re: [vtkusers] Set Different Opacity Value to 
> Different GrayScale to DisplayImage
> 
> On Mon, Jun 3, 2013 at 5:00 AM, Hongsongyang 
> <hongsongyang at 163.com> wrote:
> > Dear All:
> >     Currently, we can set different opacity value to 
> different actors.
> > However, if we only display one gray scale image. Could we set 
> > different opacity value to different Gray scale pixel 
> points? If it is 
> > possible, some useless points in a image will not be shown 
> or in transparent state.
> >
> > (Color Image is the same problem, whether we could set different 
> > opacity value to different RGB pixel points).
> >
> > Thanks a lot.
> >
> > Best regards.
> > Hong Songyang
> 
> I believe this is what you're looking for:
> 
> http://www.vtkedge.org/Wiki/VTK/Examples/Cxx/Images/Transparency
> 
> David