[vtkusers] How to change pixel color?

[Romuald BERTRAND]

Hi,

Thanks for your answers.

I have tried but pPix = (unsigned char*)id->GetScalarPointer(); doesn't work for me.

when I change the components, nothing change, and after I have display the array and I have seen it is null.
Know you why?
 
Yenan: Have you arrived to manipulate it correctly?

Thanks
 
 

> Message du 16/05/08 21:35
> De : "Mark Wyszomierski" 
> A : yenanqu at scs.fsu.edu
> Copie à : "Romuald BERTRAND" , vtkusers at vtk.org
> Objet : Re: [vtkusers] How to change pixel color?
> 
> >>  pPix = (unsigned char*)id->GetScalarPointer();
> 
> That should work, I've used it many times for instance in this project:
> 
>     http://devsample.org/index.php?option=com_content&task=view&id=48&Itemid=27
> 
> I show the value of the pixel that the mouse is over. Maybe there's
> something else going on in your pipeline?
> 
> Mark
> 
> 
> 
> On 5/16/08, yenanqu at scs.fsu.edu  wrote:
> >   How to get pointer from vtkImageData is the hardest thing,which I
> > still can not make it.
> >
> > //id is vtkImageData
> > int *uExtent = id->GetUpdateExtent();
> > pPix = (unsigned char*)id->GetScalarPointer(uExtent[0], uExtent[2],
> > uExtent[4]);
> >
> >   or
> >
> >   pPix = (unsigned char*)id->GetScalarPointer();
> >
> > the only method I could find out. It didn't work for me. try it to see
> > if it works for you.
> >
> > Yenan
> >
> > Quoting Mark Wyszomierski :
> >
> >> Yeah once you get a pointer to the pixel data in vtkImageData you can
> >> manipulate it however you want. It's just an array of values.
> >>
> >> Mark
> >>
> >> On 5/16/08, yenanqu at scs.fsu.edu  wrote:
> >>> Did you retrieve pixel data from vtkImageData seccessfully?
> >>>
> >>>
> >>> Yenan
> >>> Quoting Romuald BERTRAND :
> >>>
> >>>> Hi all,
> >>>>
> >>>> I have to display an image for my work. After, I have to change the
> >>>> color of several pixels, I don't know why. I have a vtkImageData,
> >>>> and I have search some methods to set the scalars of the pixels
> >>>> which are stored in, but I don't arrived.
> >>>>
> >>>> Someone could help me?
> >>>>
> >>>> Thanks for answers.
> >>>>
> >>>> Romuald
> >>>>
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