Did you know that you can use color contrast to make your photos more interesting and attention-grabbing? You can achieve it only if you understand the basics of color. You need to know what primary and secondary colors are and how that knowledge can help you get a better image.id you know that you can use color contrast to make your photos more interesting and attention-grabbing? You can achieve it only if you understand the basics of color. You need to know what primary and secondary colors are and how that knowledge can help you get a better image.