Patent ID: 7700265

Claim:
An image forming method comprising: subjecting a planographic printing plate precursor to exposure using laser light in a wavelength range of 250 nm to 420 nm with a one-pixel drawing time of one millisecond or less, wherein the planographic printing plate precursor comprises: on a support, an undercoat layer that consists essentially of a polymer having repeating units of the formula (A1) and the formula (A2) wherein R 1 to R 3 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom, R 4 to R 6 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a halogen atom, an acyl group, or an acyloxy group, and R 4 and R 5 , or R 5 and R 6 may form a ring, L represents a divalent linking group selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and a combination thereof, and Q represents a functional group which interacts with a surface of the support, the coating amount of the undercoat layer after drying being from 1 to 30 mg/m 2 ; and on the undercoat layer, an image recording layer that contains (A) a polymerization initiator, (B) a polymerizable compound, and (C) a binder polymer, and has photosensitivity in the wavelength range of 250 nm to 420 nm.