Then checked out Gimp - free and has advanced features ... almost as good as Photoshop, they say. Installed Gimp. "Gimp" - in English, anyway - means "lame". Kind of a dumb name for a program, but it's free, so who cares.
No search bar in the help file, couldn't find any info about color splitting.
Okay, tried and tried on my own to split the photo into primary-color layers ... tried several ways of sending each primary color to a different layer. Nothing worked.
Hmm, Googled, and found an official tutorial, it talks about "decompose". Not the best choice of names in my opinion, but Gimp is free, so who cares.
Following the tutorial step-by-step shows that the menus in my version, i.e. the current version, don't even closely match what the tutorial is talking about. Time to Google again for another answer. Google finds a forum thread from 2008 which talks about exactly this problem. Thread suggests surfing to docs.gimp.org to find a solution.
Tried several times, but Gimp's server doesn't respond at all.
Tried on my own again, several times, to figure out how to separate colors. Many bad words uttered.
I give up, Gimp, I tried your free program, but it just isn't usable. Guess I'll try a professional product instead.
Sometimes it's really true: You Get What You Pay For.
Any comments, Gimp?