A liquid ink jet recording apparatus and method which forms a multi-level tonal image by liquid droplets discharged through plural nozzles. A first scan of a recording head past a recording material ejects ink droplets from a first nozzle in accordance with a tone signal. A sub-scan operation is performed...http://www.google.com.au/patents/US6406114?utm_source=gb-gplus-sharePatent US6406114 - Tonal product recorded by ink and having a plurality of pixels with plural tonal levels
