In this tutorial you’ll learn how to add a moon to your image, and use luminance blending to realistically blend the object into your image.
Here’s an easy way to control the tonality in your images using a technique called “Self Blending.”
Sometimes the white balance in your images is "right on," and other times it's miles off—don't worry, it happens to all of us, and it's easy to fix in Photoshop!
A Detailed description of how Photoshop blend modes work. The math involved, and their interrelationships with each other are discussed in depth.