Patent ID: 7304657

Claim:
An image processing apparatus, comprising: an exposing device to expose a film sheet to form a latent image on the film sheet based on data of a diagnostic image or data of a test image; a developing device to develop the film sheet exposed by the exposing device to visualize the latent image; a density measuring device to measure a density value of the film sheet developed by the developing device; a calibrating device to obtain a calibration value from a calculation process carried out based on a result of density measurement of the test image by the density measuring device and a result of density measurement of the test image by an external density measuring device which is different from the density measuring device and to calibrate the density measuring device according to the calibration value; a storing device to store a characteristics variation table showing variations of measured values due to a condition change of the density measuring device after a calibration conducted by the calibrating device; a condition change detecting device to detect a condition change of the density measuring device between when the density value of a film of the diagnostic image is measured and when the calculation process is carried out; a correcting device to correct a density value of the calibrated density measuring device, according to a result of detection by the condition change detecting device and the characteristics variation table stored in the storing device.