To provide a developing method which enables execution of development with an increased accuracy in the case when the development of a printing plate is conducted by using dampening water and ink, and a printing machine.
This method has a process wherein an image is recorded on a printing plate by an image recording device, an ink key opening degree setting process wherein the degree of opening of each ink key in an ink supplying device is set to be larger as a pattern area rate is smaller in a region corresponding to each ink key in the printing plate whereon the image is recorded, an ink preliminarily supplying process wherein the ink is supplied onto an ink roller by the ink supplying device, an ink transfer process wherein the ink on the ink roller is transferred onto a dampening water roller, a dampening water supplying process wherein the dampening water is supplied to the printing plate by the dampening water roller, an ink supplying process wherein the ink is supplied to the printing plate by the ink roller, and a transfer process wherein the ink on the printing plate is transferred to printing paper.
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