[Paraview] Marking points in contours

["Jü En"]

Hi folks,
i'm looking for a possility to mark certain points within contour plots. The data which i'm using are binary images stored as unsigned char, non-uniform spacing (0.2, 0.2, 0.1) and a shifted origin. The points which i want to mark are given in pixel(?)-coordinates (e.g. (20,20,10)) instead of world-coordinates (given with respect to origin and spacing).
I found the option Edit->FindData, but no pixels are found when i search for certain points (pixel-coordiates).
Does anyone have a solution?

Thanks in advance,
Juergen
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