Colors can add power and meaning to images. Color relationships are part of these effects. When an entire image is of one object, the color coordination was taken care of by the designer of that object. But when various elements in the real world form unintended color relationships, its a great chance for the photographer to step in, and manipulate color.
In the image below, the red, white, and blue motif of the trolley is a given. But the coincidence of it stopping at a traffic light behind the red and blue scooters was an opportunity not to be missed. The only question was whether there was enough time to pull out an iPhone, open the Photo app, and compose an image before the light changed. Once that was accomplished, a bit of color coordinating in Photoshop, to enhance the relationship between the various reds and blues in the image, completed the process.
C. David Tobie