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Originally Posted by DNSB
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Yes, though as I wrote before it doesn't really explain it. White particles improve contrast, variations of shade and brightness, but technically are not absolutely needed for the scheme to work.
Similarly as paper is white, printing (lithopress, inkjet or laser) uses black as well as cyan, yellow and magenta, though it will "work" without black, but the blacks will be muddy and not as sharp. Higher quality printing uses more colours, because the C Y M scheme (and true on ACeP/Gallery 3) results in much dimmer red, green and blue additive primaries than the cyan, yellow and magenta secondary/complementary colours. The extra shades on inkjet printers are for resolution and better halftones, not improved colours in the sense that paper publishing of "art" books uses more colours.
Colour negative film only uses cyan, yellow and magenta layers, (white = clear film, black = cyan, yellow and magenta all at full density) but the printing process can adjust the colours using filters in the enlarger. Of course now colour negative film is scanned rather than being used with photographic paper.
Unless there is an unexpected technology breakthrough we won't see a viable ereader using ACeP/Gallery 3. Won't stop someone foolish trying.