Shèjì hǎibào shí cháng yòng duìbǐsè lái xīyǐn yǎnqiú.
Posters often use contrasting colors to grab attention.
Tips
usage
In Chinese design vocabulary, 对比色 covers both 'contrasting' and 'complementary' (colors opposite on the wheel). For a tighter 'complementary' nuance use 互补色 (hùbǔsè).