An inkjet printing composition comprises an aqueous liquid vehicle; at least one pigment having a concentration of about 1 to 5 wt %; and a latex polymer having a concentration of about 2.5 to 8 wt % and comprising a polymerized mixture of styrene, butyl acrylate, at least one of methacrylonitrile and acrylonitrile, methacrylic acid, and ethylene glycol dimethacrylate. An inkjet ink printing system comprises a vinyl medium; the at least one inkjet printing composition; and a heating device, wherein the system is configured such that upon applying heat from the heating device to the inkjet ink printed on the vinyl medium, the latex particles fuse, thereby forming a printed image with a film encapsulating at least a portion of the pigment on the vinyl medium. A method of forming a printed image of the latex polymer using the inkjet ink printing system is also provided.