Patent ID: 6392739
Filing Date: 2002-05-21
Classification: G03B

Abstract:
A method for the optimization of a copying light profile during copying of photographic originals in a photographic copier, wherein the copier comprises:a light source for producing copying light for the copying process, a number of optical, light conducting means for guiding the copying light along a light path from the light source through the photographic original to a copier material, and for the shining through of the photographic original and for the projection of the shone through original onto the light sensitive copier material, and a local transmission modulator through which the copying light is guided by way of the light conducting means, before it exposes the copier material, the transmission of which is controllable locally for the production of a transmission profile and the transmission profile of which is preselected for the copying process in dependence of the photographic original to be copied, the method comprising the steps of: a) creating a defined measuring environment for measuring a profile of the copying light by providing a transparent element with a known transmission profile in the light path for being shone through or by using the copying light without a transparent element positioned in the light path, wherein no photographic original to be copied and of unknown transmission profile is positioned in the light path, and furthermore a transmission profile specific for the local transmission modulator is provided; b) measuring the copying light resulting from step a) broken down by area, the profile of the copying light being measured and compared with a desired copying light profile; and c) optimizing the transmission profile preselected for the copying process for the copying of photographic originals onto copier material, based on the comparison in step b).