Digital image forensics aims to distinguish the forgeries from the authentic images.In order to detect blurring

which can reveal the trace of tampering

we analyze the local color correlation and consistency caused by image acquisition devices.We find that blurring can distort the intrinsic local color correlation and consistency of legitimate images.Therefore

we define the abnormity of local color property as rate of abnormal hue

of which we then develop a forensics method to detect blurring.Experimental results show that this method can detect possible blurring in images acquired from digital cameras and locate the possible tampering regions with a relative high accurate rate in detection and location.