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Set *DefaultBRColorMode: None in the vendor PPD so every job sends <</UseCIEColor false>>: Brother's Normal/Vivid modes enable the printer's own CIE conversion, which washed the colours out. Add six APPrinterPreset entries mapping print-color-mode and print-quality from driverless (AirPrint/IPP) clients onto the Brother device options; they use the notation CUPS generates itself (Apple metadata as 'key value' pairs, PPD options as '*Name Value'), because key=value strings are silently discarded. print-quality is 3/4/5. Add the PRINTER_OPTIONS env var: whitespace-separated key=value pairs applied as queue defaults on every start via lpadmin -o, validated against the queue's PPD, with warnings instead of a failed startup. Document all of it in the README. The VividNoCIE candidate was dropped after test prints showed no difference from None. Archive the OpenSpec change and sync the printserver/cups spec with the two new requirements.