Abstract: An image-forming process which comprises, upon conducting intensification of images using an intensifier containing at least one intensifying agent selected from the group consisting of peroxides, halogenous acids and cobalt (III) complex compounds, on a color photographic element comprising a support having at least one silver halide emulsion layer in the presence of a reducing agent, adding a mercapto group-free and nitrogen-containing hetero ring compound and a compound represented by the following general formula having a polymerization degree of 1 - 8,000;-- (A).sub.x -- (B).sub.y --wherein A represents ##STR1## or --CH.sub.2 --CH.sub.2 --O--, wherein R represents ##STR2## or --OH, with m being an integer of 3 - 7, R.sub.1 is an alkyl group having 1 to 6 carbon atoms, and R.sub.

Abstract: In an image intensification which comprises reacting a photographic element comprising a support having provided thereon at least one silver halide emulsion layer with at least one highly active intensifying agent comprising halogenous acids and peroxides in the presence of a reducing agent, and, if necessary or desired, a color former, a method for forming images which comprises treating the photographic element with an intensifying bath comprising1. at least one nitrogen-containing heterocyclic compound possessing an anti-fogging effect and having no mercapto group;2. bromide ions in an amount of 1 .times. 10.sup.-4 gram ion/liter or more; and3. the highly active intensifying agent in an amount of 0.25 mol/liter or more.