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So the Libra Colour 150 dpi is a bit better than a DXG 150 dpi for regular black text and white "paper", but nothing like as good as a Libra 2 Mono 300 dpi.
The Libra colour screen is essentially the Libra 2 screen with coloured dots on every pixel. Then the controller/software selectively uses the underlying mono pixels to give the desired shade as your eye averages the page.
Your eyes see much more detail in shade than hue. So Colour television uses twice to four times sharper mono detail than colour detail to save transmission space. So instead of red and green dots (if the blue dots all have black), you see yellow.
Hence pure black text on white "paper" will look a little sharper than 150 dpi, but it's not proper 300 dpi any longer.
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