Non-CMYK for printing color separation

Hello
This is one of my first posts here - I hope that I do not too bad.

I checked a few threads here, looking for prospects and has already made a few discoveries but my question remains.

I have done a few trials with a Ricoh printer and am struggling a bit with the reproduction of photographs. The printer, I work with prints a color at the time: Blue (nearby), yellow (very similar to the yellow treatment), rather dark green red (close to Pantone 032), bright and black.
So far I've used the CMYK color separation (and rather rough halftone), substitute blue and magenta red cyan, but the pictures come out, logically enough, more orange than they should be.

So my question is: you know a way to divide an image into a given set of colors? (here, I guess it would be blue, red, yellow, and the black with the fact that I can print)

Please let me know if you have any ideas!
Thank you

If something like this is not a good place to start?

Tags: Photoshop

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