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Screenshots on the Kobo H2O original are in colour.
Detecting if a display is colour or mono is an inherently dubious idea. Better to test what covers look like in mono, or even 16 shade mono. Easy in any image editing program.
You can use a "best" colour image for covers on the websites listing books. Often anyway a good mono image is automatic with a good colour image, if the mono is poor it suggests the shadows, highlights and general contrast is poor in the colour version.
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