This is one of my plugins for ArtEffect2/3+.

SmartBlur is a blurrer (gaussian or average) that blurs a picture without
loosing sharp edges. It can remove noise visible in large equal areas and
leaving details untouched. It is well suited to remove moirés from scanned
printings without smoothing the details out. Very useful if natural pictures
are mixed with artifical graphics/text, e.g. cover of a CD.

There is another similar plugin available: SmartMedian

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                12748   21156  60.3% -lh5- 1414 Jul 22  1999 plugins2/SmartBlur.p2m
[generic]                13065   22460  58.2% -lh5- 539d Jul 22  1999 plugins2/SmartBlur.p2n
[generic]                12742   21152  60.2% -lh5- 23de Jul 22  1999 plugins2/SmartBlur.p4s
[generic]                 3591    9018  39.8% -lh5- 08bb Jul 22  1999 SmartBlur.guide
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         4 files   42146   73786  57.1%            Jul 25  1999