The process of adjusting color is a bit obtuse, but the tablet comes out looking perfectly serviceable for most content right out of the box. The E Ink Center provides quick control over the display’s refresh modes and a few special color controls. Onyx has simplified its display controls, using a slider to adjust brightness and a second slider to control color temperature (Boox used to use separate sliders for the warm and cool lights). Navigating apps, browsing the web, and reading comics are so much more pleasant and easy with the added color, so it's well worth the small loss of brightness. But on the Boox Tab Ultra C, the color feels like a more natural addition on top of the rest of the content and measures in at 150ppi. Two years ago, I found the color layer of the Boox Nova3 Color a little grainy due to its low resolution, which amounted to just 100ppi, and that made the reduction to brightness a hard sell. The new Kaleido 3 LCD layer is a clear-to-see upgrade on Kaleido Plus.
