| http://www.w3.org/ns/prov#value | - Another object of the present invention is to provide an image forming apparatus and method in which, if an abnormal portion is found in an intensity value of a gray-scale test pattern when the pattern is read in, notification is given of the fact that some abnormality has developed, thereby making it possible to prevent an erroneous operation, and in which maintenance is facilitated by estimating
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