Rakuten Kobo is launching its first color e-readers, the Kobo Libra Colour and the Kobo Clara Colour. Both use E Ink’s latest Kaleido color screen technology, which has subtle, pastel-like hues and drops from a 300ppi grayscale resolution to 150ppi when you view content in color.I’ll be testing both e-readers soon, but so far, they look like small upgrades to Kobo’s existing e-readers. That’s not a bad thing, though! The seven-inch Kobo Libra 2 is my favorite e-reader outside of Amazon’s ecosyst...