Whats its color is an excellent powerful image-color processing utility and which also web based free service for you.
This site will evaluate an image and give you the image’s primary and complementary dominant colors of an image, how many visually unique colors are in an image, and the top ten visually unique colors in an image. From this site you can easily find out Dominant Average Color of your picture or your designs. Extremely useful when creating any type of designs around an image. The more colorful the image, the better the results. And results should display your image on the best suited background for that image.