[Gimp-user] Despeckling photos

[Gimp_Noob <forums gimpusers com>]

> There's no simple answer - you have to d the best you can with what
> you've got. Sometimes resizing (image->scale) by a factor of 3 can
> help: open image->scale image, append
>  * 3
> to the width
> and press tab, and GIMP will do the multiplication :) Use "cubic"
> interpolation.
>
> Then blur the now-larger image with radius 5. Then scale back down
> (again cubic but you could use / 3 instead of * 3 to have GIMP do the
> division) and then sharpen (filters->enhanve/>unsharp mask).
>
> Technically what's going on is that this procedure will give the image
> a wider number of pixel values - more greys - especially in 16 or 32
> bit - and reduce some of the effects of jpeg artifacts.  <ale sire the
> image is in greysvcale/grayscale or RGB mode first, not indexed, or it
> won't help.

I  lost some detail on the edit, but I got rid of a lot of the noise thanks.

Attachments:
* https://www.gimpusers.com/system/attachments/1335/original/despeckling.png
* https://www.gimpusers.com/system/attachments/1336/original/despeckling-edit.png

-- 
Gimp_Noob (via www.gimpusers.com/forums)