A method and apparatus for measuring the color tone density of an image output from a multipass color printer consumes a minimum of time by using a test pattern that includes test patches for all of the developing units in the printer. The method includes developing a test pattern, which includes test patches for all developing units, on an organic photo conductor, measuring the color tone density of the developed test pattern, and adjusting developing variables according to the measured color tone density. Accordingly, it is possible to reduce the time required to measure the color tone density of an image output from a multipass color printer, using the test pattern.
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