use one tool in photoshop - Curves to lighten up your images, but it can make your colors and contrast pop by making an S curve. To do that, just add a second point in the curves window, and drag it down a bit.
An Infographic On The Psychology of Color. Struggling to find the perfect color for something? Try taking a look at the emotions that colors evoke in people before choosing the latest color pallet for a new project.