MKR RGB Matrix - How to use the systanx color

Official Hardware MKR Family MKR Shields
1

Hi together
I have bought a MKR Vidor 4000 and a MKR RGB shield. (wasn't aware as a newbie, that there would not so much material be around for those two)
So far I have tried several things with the graphics lib and was able to draw lines and today a smiley on my shield.
But to draw a picture it became a bit much effort because I was editing three 2d Arrays (one for each color) in order to store all the information.

So I was wondering how to use the color syntax. How can to initialise and use it?

Syntax
YourScreen.set(x, y, r, g, b)
YourScreen.set(x, y, color)
color: 24-bit RGB color, 0xrrggbb
Thanks in advance for your help!
Christoph

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