Re: [Gimp-user] Despeckling photos

[Gary Aitken <gimp dreamchaser org>]

On 12/4/19 1:44 AM, Liam R E Quin wrote:
> On Wed, 2019-12-04 at 03:39 +0100, Gimp_Noob wrote:
> > I have several photos which I'd like to try to clean up as best I
> > can.
>
> First, scan at higher resolution than yu plan to use. At least double.
>
> SOmetimes i find that select by colour works well.
> (1) make sure you have both blacks andwhites in your image, e.g. with
> levels or curves.
> (2) select by colour on a white area.
> (3) grow selection e.g. 2 pixels
> )4_ shrink selectin by 2 pixels
> (6) feather by 1 pixel (requires greyscale or RGB iamge, not indexed)
> (7) fill with white (e.g. drag the swatch from the toolbox, or use
> control-. or control-,)
> (8) select none
>
> repeat steps 2 to 8 with black instead of white.

Can you explain what steps 3 and 4 acconplish?  It seems like they should
cancel each other.

Gary