A calibration for a scanner, which is used as a densitometer, is carried out
always
with high accuracy. More specifically, an image processing method of generating
a conversion condition for a scanner which is used for reading an image and generating
image data, is provided. The method including the steps of: obtaining a reading
property of an object scanner based on image data obtained by that the object scanner
reads a chart, and generating the conversion condition for the object scanner based
on the reading property of the object scanner, a previously prepared reading property
of a standard scanner and a previously prepared brightness-density conversion condition
for the standard scanner.
