PURPOSE:To improve graininess and visual graininess by incorporating a diffusion resistant coupler producing a properly dispersible dye by coupling with the oxidized product of a developing agent, and another coupler forming a dye of a color equal to said coupler and having a specified coupling velocity. CONSTITUTION:Both of a dye diffusion type coupler and a coupler forming a dye equal in color as said coupler and having a coupling velocity as high as 1.3-15 times that of said coupler are used. As a result, a visual graininess is improved by the oozing effect of the dye diffusion coupler in a lower concn. part, and since velocity of the reaction of the high-speed reactive coupler with the oxidized product of a color developing agent is high in middle or higher concn. parts, development inhibitory action due to the oxidized product is reduced, and the amt. of developed silver increases in highly exposed areas, and all of the applied couplers react, resulting in rapidly erasing grains as well as mottles, thereby improving graininess. Since high sensitivity and high sharpness of the high-speed reactive coupler are exhibited, a material of high sensitivity and capable of forming high image quality can be prepared.
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