IMHO perhaps you can do it by :

1)        converting your image to RGB.
2)        selecting the area(s) you want to manipulate using the free
selection tool
3)        using the "Select by Color" tool and manipulating (perhap
increasing) the threshold.
4)        converting the image back to the original mode.

Best regards


> Date: Mon, 28 Mar 2005 14:53:08 -0500 (EST)
> From: Sebastien Cabot <[EMAIL PROTECTED]>
> To: gimp-user@lists.xcf.berkeley.edu
> Subject: Re: [Gimp-user] How to select isolated pixels ?
> ....
> > Sebastien Cabot <[EMAIL PROTECTED]> writes:
> > > I have a black & white image of a texte document, I would like to
> > > eliminated the isolated pixel (small group of 1 to 5 pixels in the
> > > white area of the page) to keep only the black text.
> --- Sven Neumann <[EMAIL PROTECTED]> wrote:
> > Despeckle should be able to do that, give it a try.
> Thanks, I didn't knew about despeckle. Unfortunatly this plug-in in addition 
> to
> remove the isolated pixels also remove some pixels of the non isolated one
> (letter contour). This is exactly what I'm trying to avoid. I must remember I
> have a monocrome image (2-bit) which greatly reduce plug-in option like
> despeckle.
> Utitimatly what I need, is after a selection of all the black pixels, find a
> way to remove from it all area made of more than 5 contiguous pixels. The
> remaning areas of 5 or less pixels will be the small dots I want to remove.
> Anyone have a suggestion how I can modify my black pixels selection in such a
> way ?
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