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<DIV><FONT face=Arial size=2>Hi everybody!</FONT></DIV>
<DIV><FONT face=Arial size=2>Finally I've found the origin of the banding
effect: it is due to the <STRONG>vtkPNGReader</STRONG> I was using. If I
use the <STRONG>vtkBMPReader</STRONG> the banding effect disappear. Most likely
the problem originates from the uncompress action of the reader, because the
single png slices are correct. I'd like to thank Lisa Avila and Benjamin King
for their useful suggestions.</FONT></DIV>
<DIV><FONT face=Arial size=2>Thank you again</FONT></DIV>
<DIV><FONT face=Arial size=2>Sandro Rosi</FONT></DIV></BODY></HTML>