Image forming method

Abstract

An image-forming method using an exposure head having plural beam light sources that correspond to each exposure point and that emit each light with the same wavelength, to subject to exposure a light-sensitive material provided at least with a light-sensitive silver halide emulsion and a binder on a support, which method comprises arranging M sets of the beam light sources in a sub-scanning direction, perpendicular to a main scanning direction, along which the exposure head is moved, at predetermined intervals, and allowing the light-sensitive material to move in the sub-scanning direction, in steps of a distance of (the length of the exposure head in the aligned direction)/N (N≧2), to carry out superposing exposure N times, with an exposure time per exposure being 10 sec or less, thereby forming M×N pixels per exposure head in every M sets of exposure point, to form an image, wherein the silver halide emulsion contains Ir, in an amount to be added of 10 to 10 mol per mol of silver halide. This method can eliminate or improve uneven density of exposure, particularly streaks on an image caused by a difference in the hysteresis-of multiple exposure of light source points at both ends of an exposure head in a scanning exposure-type image-forming method that uses in which plural exposure light sources whose exposure time per exposure is 10-3 sec or less.