Re: color border in image, drop everything outside of it

From	<tomas@tuxteam.de>
Newsgroups	linux.debian.user
Subject	Re: color border in image, drop everything outside of it
Date	2020-11-15 10:40 +0100
Message-ID	<BbmFP-4Uy-9@gated-at.bofh.it> (permalink)
References	<Bbdjb-7Ih-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Sun, Nov 15, 2020 at 12:31:22AM +0100, Emanuel Berg wrote:
> 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?

Your request is a bit... unspecific.

Are you (a) after a tool which you use interactively, where you
actually see the image you described above, and where you can
click into that loop to start the operation?

Or is it (b) rather some kind or "batch mode", where you give the
program the image file *plus* the coordinates of that point inside
the loop where to start?

For ease of search, the operation you're describing is usually
called "flood fill". If you are after (a), your friend is The Gimp;
I guess Krita will fill that bill as well. If it's (b), the usual
standard is "mogrify", from the ImageMagick suite. Look at [1] for
the details on flood fill.

Getting warm with the ImageMagick programs takes a bit of practice,
but it's worth it. Come back if you get stuck.

Cheers
[1] https://imagemagick.org/script/command-line-options.php#floodfill
 - t

Thread

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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