how to compare 2 image fild in sql

[combo_ci]

hi i have a fild in my db with (image) datatype i write a sp with this code to compare 2 image fild select isnull(srl,-1) as srlFng from base_info where img =@img but this error show when i press check sintax error 306: the text,ntext,and image data tyoes cannot be compared or sorted, exept ehrn using is null or Like operator can anyone help me in this problem? thnx