| http://www.w3.org/ns/prov#value | - A method according to claim 1, further comprising the steps of:supplying a different phase control signal to a laser light modulation unit for each of basic colors including cyan, magenta and yellow; and outputting a control signal relating to one dot from said laser light modulation unit based on the multilevel image signal and the phase control signal, so that each dot of the multilevel output i
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