[Gimp-user] ghost outline

Newbie here. When removing background from black and white line art,
there remains a thin white ghost outline around the black object.
Really shows up when a color background layer is below. Especially a
problem as I want to use as a logo. Cannot find any tutorials on this
except as removing foreground image in photo.

All to do with anti-aliasing. Assuming you are using Windows and Gimp 2.10

You have an alpha channel on your xcf but only one layer. Since B & W line art
assuming a colour select on the white and a delete might give something like
screenshot 1

You can mess around with the threshold value but the usual way is grow the
selection by 1 (or 2) pixel(s) to include the semi-transparent pixels before
deleting. Select menu -> Grow.  screenshot 2

With Gimp 2.10 the color 2 alpha tool Color menu -> Color to Alpha is adjustable
and should give a good result. screenshot 3

A more comprehensive description here:


* https://www.gimpusers.com/system/attachments/1210/original/01-remove.jpg
* https://www.gimpusers.com/system/attachments/1211/original/02-remove.jpg
* https://www.gimpusers.com/system/attachments/1212/original/03-remove.jpg

rich404 (via www.gimpusers.com/forums)

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