A method of compensating the uniformity of an OLED device that includes measuring the performance of light-emitting elements at three or more different input intensity values. Calculation of parameters a and b, for each light-emitting element, is performed to minimize the sum, for each of the three or more input intensity values i, of a minimization function: f(y.sub.i,i,(y.sub.i-g(y.sub.i,i,a,b)).sup.2) where y.sub.i is the performance value of the light-emitting element or groups of elements in response to an input intensity value i, and g is a function that is a simplified representation of the performance of the one or more light-emitting elements or groups of elements. A linear transformation function is formed as: f(i)=mi+k, where m and k depend upon the function g, and the parameters a and b.