Hi all!
Thanks a lot to you all for your precious help! I am struggling experiments and reports. Sorry, I did not answer before.
I had hoped I would have time to go deeply into Image Magic earlier, but it appears that my “free-time” is now preciously kept to have a bit of sleep!
@Elle You did an impressive work and very detailed and precise instruction manual. I am deeply thankful.
Fingers crossed, I should have time to go back to colorimetry next week, and will get back to you! 
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