It's a guess, but I think I know why the K2 font looks lighter. I think its due to the increased levels of gray scale.
Over the years, I've noticed this on graphics I've worked on. Turn a graphic from black to grayscale or turn on anti-aliasing. It makes the edges look smoother. However, when you have a really thin line you can have problems.
Say the line is narrower than one pixel. With black and white only you can only show the line through a black pixel. With gray scale you can use a gray pixel to indicate that the entire pixel is not black.
As a result thin lines, like the lines of small fonts, are gray instead of black and they are not as visible on the grayish e-ink background.
Michael
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