A method for manufacturing a medium in sheet form that can be used for the sublimation transfer of an ink onto an imprintable medium; the medium in sheet form comprises at least one supporting layer, at least one adhesive coating and a plurality of granular or elongated elements designed to be applied to the adhesive coating; the method comprising the steps of preparing the granular or elongated elements so as to render them sensitive to the action of an electromagnetic field and applying the granular or elongated elements to the adhesive coating with the interposition of the electromagnetic field having lines of force f that are substantially perpendicular to the supporting layer, so as to arrange a monolayer of granular or elongated elements according to a predefined distribution.