color border in image, drop everything outside of it

From	Emanuel Berg <moasenwood@zoho.eu>
Newsgroups	linux.debian.user
Subject	color border in image, drop everything outside of it
Date	2020-11-15 00:40 +0100
Message-ID	<Bbdjb-7Ih-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hello, is there a tool/command/script anywhere that can overwrite
with a single color (or make transparent) every pixel to the left,
above, right, and below a certain other color?

e.g., if one draws a loop of black, tell the program black is the
border, the result would be only what is within the loop?

TIA
            
-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal

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color border in image, drop everything outside of it Emanuel Berg <moasenwood@zoho.eu> - 2020-11-15 00:40 +0100
  Re: color border in image, drop everything outside of it Michael uplawski <linux-gate@don.blech.e4ward.com> - 2020-11-15 10:00 +0100
    Re: color border in image, drop everything outside of it Emanuel Berg <moasenwood@zoho.eu> - 2020-11-15 10:10 +0100
      Re: color border in image, drop everything outside of it Michael uplawski <linux-gate@don.blech.e4ward.com> - 2020-11-15 11:10 +0100
        Re: color border in image, drop everything outside of it <tomas@tuxteam.de> - 2020-11-15 11:30 +0100
        Re: color border in image, drop everything outside of it Emanuel Berg <moasenwood@zoho.eu> - 2020-11-22 03:30 +0100
  Re: color border in image, drop everything outside of it <tomas@tuxteam.de> - 2020-11-15 10:40 +0100
    Re: color border in image, drop everything outside of it The Wanderer <wanderer@fastmail.fm> - 2020-11-15 11:30 +0100
      Re: color border in image, drop everything outside of it Jeremy Ardley <jeremy@ardley.org> - 2020-11-15 12:00 +0100
      Re: color border in image, drop everything outside of it <tomas@tuxteam.de> - 2020-11-15 12:10 +0100
        Re: color border in image, drop everything outside of it The Wanderer <wanderer@fastmail.fm> - 2020-11-15 12:50 +0100
          Re: color border in image, drop everything outside of it <tomas@tuxteam.de> - 2020-11-15 13:30 +0100
      Re: color border in image, drop everything outside of it Michael uplawski <linux-gate@don.blech.e4ward.com> - 2020-11-15 12:10 +0100
        Re: color border in image, drop everything outside of it Michael uplawski <linux-gate@don.blech.e4ward.com> - 2020-11-15 12:50 +0100
      Re: color border in image, drop everything outside of it Emanuel Berg <moasenwood@zoho.eu> - 2020-11-22 03:20 +0100
    Re: color border in image, drop everything outside of it mick crane <mick.crane@gmail.com> - 2020-11-15 11:40 +0100
    Re: color border in image, drop everything outside of it Emanuel Berg <moasenwood@zoho.eu> - 2020-11-22 03:20 +0100
      Re: color border in image, drop everything outside of it David Wright <deblis@lionunicorn.co.uk> - 2020-11-22 04:40 +0100
        Re: color border in image, drop everything outside of it Emanuel Berg <moasenwood@zoho.eu> - 2020-11-22 05:20 +0100
          Re: color border in image, drop everything outside of it David Wright <deblis@lionunicorn.co.uk> - 2020-11-23 06:20 +0100
            Re: color border in image, drop everything outside of it Emanuel Berg <moasenwood@zoho.eu> - 2020-11-23 06:30 +0100
              Re: color border in image, drop everything outside of it David Wright <deblis@lionunicorn.co.uk> - 2020-11-24 20:50 +0100
                Re: color border in image, drop everything outside of it Emanuel Berg <moasenwood@zoho.eu> - 2020-11-24 22:40 +0100
                Re: color border in image, drop everything outside of it <tomas@tuxteam.de> - 2020-11-24 22:50 +0100
                Re: color border in image, drop everything outside of it Emanuel Berg <moasenwood@zoho.eu> - 2020-11-26 01:30 +0100
                Re: color border in image, drop everything outside of it <tomas@tuxteam.de> - 2020-11-26 09:50 +0100
                Re: color border in image, drop everything outside of it Emanuel Berg <moasenwood@zoho.eu> - 2020-11-26 12:30 +0100
                Re: color border in image, drop everything outside of it <tomas@tuxteam.de> - 2020-11-26 12:40 +0100
                Re: color border in image, drop everything outside of it Emanuel Berg <moasenwood@zoho.eu> - 2020-11-26 12:50 +0100
                Re: color border in image, drop everything outside of it <tomas@tuxteam.de> - 2020-11-26 14:10 +0100
      Re: color border in image, drop everything outside of it <tomas@tuxteam.de> - 2020-11-22 10:10 +0100
        Re: color border in image, drop everything outside of it Emanuel Berg <moasenwood@zoho.eu> - 2020-11-22 10:30 +0100

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