Reducing colors in vector artwork to 12 in Illustrator

Hi Lukas,

Thanks for reaching out. In addition to the suggestion shared by Federico, you can also take a look at this help article: https://helpx.adobe.com/in/illustrator/using/color-groups-harmonies.html#reduce_colors_in_your_artwork

Let us know if that helps or if you need any further assistance. 

Regards,

Srishti

Well, it is at left of Kleuren. There is an icon (Color Reduction Options) that opens a window, type there 12 colors and below Colorize method, select: EXACT, to avoid tints.

Then, before closing the Recolor panel click at the top right side icon to add those 12 colors to a new group in the Swatches panel where you can convert them to Global, edit them,...