[vtkusers] Loading images in a memory efficient way

[John Eke]

Hi Guys/Girls,

Please take a look at the simple code snippet below:

int main ()
{
    vtkRenderer *ren = vtkRenderer::New();
    vtkRenderWindow *renWin = vtkRenderWindow::New();

    vtkRenderWindowInteractor* iren = vtkRenderWindowInteractor::New();
    renWin->SetInteractor(iren);

    renWin->AddRenderer (ren);
    
        vtkPNGReader*imageReader = vtkPNGReader::New();
        imageReader->SetFileName("image.png");
        imageReader->Update();

        vtkImageActor *actor = vtkImageActor::New();
        actor->SetInput(imageReader->GetOutput());
        ren->AddActor(actor);
    
    iren->Initialize();
    iren->Start();
    
    imageReader->Delete();
    actor->Delete();
}

It simply loads an image (image.png) and displays it.  In memory, it takes up about 16MB of memory. When I strip away the image loading part and just leave in the render window, interactor, and renderer.. the program uses about 6.5MB of memory.

The image I had used is about 3.2MB in size. So from my calculations, just loading and displaying the image used just over 9MB, which is about three times he original image size!!

Is this accurate? Am I doing something wrong? Is there a more efficient way to do this?

Any help is much appreciated.

Thanks,

John E



      
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