How can remove the edge line ?

imager · **Joined:** Jul 26, 2025 **Posts:** 9

GIMP Version: 2.8.14
Operating System: Linux
OS Version: Debian 12 + Lxde (desktop)
GIMP Experience: New User

How can remove the edge line in the image?

contrast_ · **Joined:** Oct 31, 2020 **Posts:** 2012

I have a plugin named threshold alpha 2 that does it. You can download it here.

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threshold_alpha_2_SourceCode.zip [4.32 KiB]
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threshold_alpha2_linux_binaries_gegl_plugin.zip [4.82 KiB]
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threshold_alpha_2_windows_binaries_gegl_plugin.zip [30.69 KiB]
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Depending on your OS put the binary in

Windows

C:\Users\(USERNAME)\AppData\Local\gegl-0.4\plug-ins

Linux

~/.local/share/gegl-0.4/plug-ins

Linux (Flatpak includes Chromebook)

~/.var/app/org.gimp.GIMP/data/gegl-0.4/plug-ins

Then Restart GIMP and

if on GIMP 3

/ search for threshold alpha 2

if on GIMP 2.10 to go the GEGL operation menu and look for "threshold alpha 2" GIMP 3 also has this option. Then apply the filter, the higher the slider the less soft edge excesses

Wallace · **Posted:** Tue Jul 29, 2025 5:13 pm **(#3)**

Using GIMP 2.8 I used Curves Adjustment.
Set channel to "Alpha" as seen in the screenshot.

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women-bg_wallace_edit.png [ 88.3 KiB | Viewed 681 times ]

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Screenshot (72a).png [ 29.91 KiB | Viewed 680 times ]

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File comment: Screenshot

Screenshot (72).png [ 261.21 KiB | Viewed 681 times ]