The pot calling the kettle black is a well accepted idiom in English, and has many equivalents in other languages.
But there are some occasions when this phrase is not quite appropriate. When one uses this idiom, it seems that one is acknowledging that the transgression is equally applicable to both parties being referenced.
What if the accuser (i.e., pot) is known to be guilty of a perceived transgression, but the target (kettle) is unjustly accused? Is there another appropriate idiom that captures the essence of the situation?