The visualization of color choices plays an important role in many applications. A printed fan deck is a common tool for visualizing and selecting colors for painting a room, for example. While there are many similar examples, almost all involve some standard pre-defined color palette that is professionally arranged onto a fan deck and printed in large quantities for future distribution to end users. However, what happens if any of the printing parameters changes (substrate, inks) or if you have a very specific task in mind that only requires a small subset of colors? In this case, a custom printed fan deck would provide a more up-todate and efficient format for visualizing the color choices for this specific task. We developed a system for creating custom fan decks that works particularly well for visualizing colors in a multiprimary printing system. First, the set of colors to include in the