How can I separate an into groups?

[Krikor]

(12-07-2020, 01:53 PM)rich2005 Wrote: You could try the gimp_gmic_qt plugin. Get the Windows installer from http://www.gmic.eu

Look for the filter Layers -> Colors to Layers and play around with the settings.

example:  https://i.imgur.com/j3gK1SJ.jpg

Following the tip of rich2005 the result was much better:
01 - G'micQT - Layers -> Colors to Layers
Then apply:
02 - Layer - Extract Objects - Extract Objects to Layers (adjust the threshold) for layers with more than one color per layer; green and pink.
03 - Erase the initial layers that had two objects per layer.