[vtkusers] Can anyone help on how to extract grey/color information from image pixel by pixel in VTK?

[Simon DROUIN]

Make sure you call vtkJPEGReader->Update() or that your pipeline is 
executed before trying to access pixel information.

Simon


Q Ma wrote:

>Hi, there,
>
>I used vtkJPEGReader to read in a JPG image.
>Then, I try to extract grey/color information from image pixel by pixel.
>Although some methods seem should work, such as:
>vtkJPEGReader->GetOutput()->GetScalarComponentAsFloat(x,y,z,0)
>However, I can not make it work.
>
>Can anyone give me some idea on how to do this?
>Thanks.
>
>Regards,
>Qi
>
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