Frantisek,

  Is the subject low contrast? It's likely the blue noise is generated
  by the auto expanding of the contrast range in the scanner driver.
  Try re-scanning with a software that doesn't alter the original
  scanned image, like Vuescan, and then adjust the levels yourself.
 
  Servus,  Alin

Frantisek wrote:

F>  What's worse is the horrible
F> grain or noise I get scanning iso 800 films and adjusting the colour
F> temperature to correct for tungsten light. Blue speckled noise all
F> over. And sharp :-( It almost seems as the nikon is sharpening the
F> blue channel?!?


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