Patent ID: 6023285
Filing Date: 2000-02-08
Classification: B41J,G03D,H04N

Abstract:
In a photothermographic laser imaging system including a laser printer for exposing photothermographic media to digital data, a thermal processor for thermally developing said exposed photothermographic media to render a visual image of the digital data and a densitometer for reading the density of said visual image, a method for establishing calibration of said system comprising the steps of:reading optimum thermal processing parameters including processor temperature from a bar code associated with unexposed photothermographic media;setting said thermal processor to operate at said read parameters;exposing a calibration media by said laser printer, said calibration media including a multiple step gray scale pattern including a minimum density step, D.sub.min, and an upper density step, D.sub.UDP ;reading with said densitometer the densities of said multiple step gray scale pattern from the developed calibration media;calculating a code value to optical density look-up-table from said read densities; andif said D.sub.min and D.sub.UDP values are within tolerances, using said calculated look-up-table to process successive media; butif said D.sub.min is greater than a predetermined value, adjusting said thermal processor temperature down, and if said D.sub.UDP is less than a predetermined value, adjusting said thermal processor temperature up.