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Both the fb and its QImage (or whatever Qt thingy the QPA uses, cba to check) backing store are @ 32bpp (e.g., RGBA).
So whether you screenshot via Nickel (Qt) or fbgrab (fb), you'll get color (unless you use a sane setup with proper cover thumbnail dithering ;p).
This is not true for KOReader, where we swap to grayscale (so does Plato, on *almost* every device. IIRC, the exception is the Clara, because kernel issues).
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