How to extract (keep) only certain colors in an image?

A

Andrzej Wielski2015-11-27 22:34:38

PHP

Andrzej Wielski, 2015-11-27 22:34:38

There is, for example, such an image.

The goal is to remove everything except the following colors:

Please suggest an idea, how best to do this?
Googling hasn't brought any results.

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1 answer(s)

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xmoonlight, 2015-11-27
@wielski

Just a nice script for this task: www.fmwconcepts.com/imagemagick/mapcolors/index.php
For red:

convert input.png -fill white -fuzz 10% +opaque "#FF0000" result.png