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ghost outline

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ghost outline mauka7 08 Jul 00:37
  ghost outline rich404 08 Jul 08:45
2019-07-08 00:37:37 UTC (4 months ago)
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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.

2019-07-08 08:45:05 UTC (4 months ago)
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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.gimp-forum.net/Thread-Background-removal-or-replacement-on-text-logos-and-other-computer-graphics