[Insight-users] problem drawing a line into image with setPixel and write it to HD

[a.bongers at mediri.com]

Hi,

I've been trying to draw lines into an image using the setPixel method.
And having some problems with writing image with the changed values to
disk.

This is how I set the pixelvalue:

    image->SetPixel(index, value);

When I read the pixel values I set befor using

    image->GetPixel(index, value);

I can retrieve the value - so far everything seems to be O.K.

The problem occurs when I try to write the image to disk using:

   writer->SetInput(image);
   writer->Update();

The image does not change. So I don't see the line in the image. It
seems that when I update the writer it just uses the unmodified image.

when I repeat
   image->GetPixel(index, value);
after updating the writer I get the value I had before making the
change...

Could anybody tell me what I am doing wrong ?
Is this the correct way to draw some figures into images, or is there
some other method ?
Seems to be that only the value is passed to the method and not the
reference ?!

Would be great if anybody could give me a hint...

Thanks

André