Separating image into four primary colors

[Krikor]

Using G'MIC version 2.9.2, when I use "GMicQt plugin: Colors / Decompose Channels and set the color base to CMYK and the action to Decompose" my result is not colored as in the image shown by denzjos in post #2

In fact, this is the result I get when using this plugin: ( [G'MIC] Decompose Channels: fx_decompose_channels 10,0,0,0 )

However, using the Separate + plugin I get the colorful result.

Could someone with a version like mine from G'MIC or more current could check what result this plugin generates? Black and white or colorful?

BTW: @rich2005 I am now able to use the script you made available in post #7. This script is very useful! Thank you!