I'm trying to remove isolated black pixels in large white areas of a tiff image.
  The image is quite large and is black and white only.

The despeckle filter (Filters->Enhance->Despeckle) doesn't seem to do anything,
except that it changes the whole image to white if the white slider is set to
256, and makes the black areas much larger is the black slider is set to -1.  

Reading the documentation isn't much help -- in fact the phrase "You ought to
select isolated defects before applying filter." in the help file is quite
mysterious.  What does it mean?

Any help would be very welcome - jon

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