The phrase "contrasting effect" means that two or more things are being compared or contrasted to highlight their differences, which can have a noticeable impact or result. Full definition
Researchers have posed several different explanations, which you can read about in this article that contrasts the effects of authoritarian parenting with the effects of authoritative parenting. (parentingscience.com)
The couple designed the large dining room table, which has a stainless steel base, and had the wooden dining chairs stained in a light tone for contrasting effect. (styleathome.com)
We invite all artists to submit work that explores visual elements being placed close together with contrasting effect. (thepaintingcenter.org)