A method of forming a colour graduated picture from a black-white graduated picture and in particular a method of producing a colour graduated isobar representation of a pressure distribution

摘要

A method of forminq a colour graduated isobar picture, particularly of the footprint of a pneumatic tire, in which a black-white graduated picture of the pressure distribution is made by loading a tire (16) against an elastomeric membrane (10) having a plurality of shaped projections (12) on one side thereof which contacts a transparent plate (15). A picture of the contact pattern formed by the projections with the plate is photographed. The black-white picture is then placed in Juxtaposition with a heat sensitive liquid crystal sheet which is activated by directing radiant heat onto the liquid crystal sheet throuoh the black-white picture. The image of the activated liquid crystal sheet is recorded preferably by colour photography.