Internal latent image-type direct positive silver halide emulsions and photographic materials

A photographic material comprising a support having thereon at least one photographic layer containing a previously unfogged internal latent image direct positive silver halide emulsion containing at least one spectral sensitizing dye represented by formula (I):

• ##STR14## wherein one of R.sup.1 and R.sup.2 represents a sulfoalkyl group and the other thereof represents an unsubstituted or substituted alkyl group, an unsubstituted or substituted aryl group, or a pyridyl group;
• X represents a sulfo atom or an oxygen atom;
• Y represents a sulfur atom, an oxygen atom, or ##STR15## wherein R represents a lower alkyl group or --CH.sub.2).sub.n.sbsb.1 O--CH.sub.2).sub.n.sbsb.2 OH, wherein n.sub.1 and n.sub.2 each represents an integer of 1 to 4;
• and W represents a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group, or an unsubstituted or substituted phenyl group.

A method of forming an image comprising imagewise exposing and developing a photographic material comprising a support having thereon at least one photographic layer containing a previously unfogged internal latent image direct positive silver halide emulsion containing at least one spectral sensitizing dye represented by formula (I):

• ##STR17## wherein one of R.sup.1 and R.sup.2 represents a sulfoalkyl group and the other thereof represents an unsubstituted or substituted alkyl group, an unsubstituted or substituted aryl group, or a pyridyl group;
• X represents a sulfo atom or an oxygen atom;
• Y represents a sulfur atom, an oxygen atom, or --N--R, wherein R represents a lower alkyl group or --CH.sub.2).sub.n.sbsb.1 O--CH.sub.2).sub.n.sbsb.2 OH, wherein n.sub.1 and n.sub.2 each represents an integer of 1 to 4;
• and W represents a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group, or an unsubstituted or substituted phenyl group;
• wherein said photographic material is processed in the presence of a fogging agent.