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The THRESHOLD submenu sets the
GRAYVALUE threshold at which the EDGE
of a particle is detected.
GRAYVALUEs range between 0 (=black)
to 255 (=white).  The default
THRESHOLD GRAY VALUE is 90.  If you
have an especially LIGHT image,
then you should move your THRESHOLD
to a HIGHER value. If you have an
especially DARK image, then you
should move your THRESHOLD to
a LOWER value.  To remove this box,
click on <OK>.
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