hi jonathan,

Selon Jonathan Ryshpan <[EMAIL PROTECTED]>:

> I'm trying to remove isolated black pixels in large white areas of a tiff
> image.

For this application, erode or dilate (I get them mixed up) is probably the best
option. If you follow a few erodes by a few dilates, the end effect is the
removal of tiny specs and detail on the bigger specs.

example:

''''''''         ''''''''         ''''''''
''''''*'         ''''''''         ''''''''
'''''*''         ''''''''         ''''''''
'***'*''   ->    ''''''''   ->    ''**''''
'*****''  erode  ''**'''' dilate  '****'''
''**''*'         ''''''''         ''**''''
''*'''''         ''''''''         ''''''''
''''''''         ''''''''         ''''''''

> 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?

just that despeckle can damage stuff which is just fine, in a photo, so
selecting areas where you're interested is a good thing.

Cheers,
Dave.

--
Dave Neary
Lyon, France
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