Motion Graphics - Remove White background

Hi. I am just beginning to use motion graphics in PP and After effects and I have a question. ALot of the motion graphics are on white backgrounds . I assume there is an easy way to remove the background without distorting the subject of clip - even if the subject has white . HOw can i do this - Ive tried keying out the white - luma key etc but they all effect the subject if the subject has white?
Thanks

hi u can get buy or do by yourself an action to remove the white however if most of professionals work on green screen this is because this seems to be the most convenient indeed