The phrase "predominant color" refers to the main or most noticeable color in a picture, object, or any visual scene. It is the color that stands out the most or covers the largest area. Full definition
What predominant color do you see coming through? (mindbodygreen.com)
These free sites will help you upload an image, instantly send back the color distribution and, in some cases, show the most predominant color. (artbusinessnews.com)
Now marketed outside the US as Ambilux, this take on bias lighting is slightly different in that it mimics predominant colors found in the content being displayed on the screen. (digitaltrends.com)