Quotes from Glenn Randall

Regardless of how you come up with the good land and good sky images, you'll need Photoshop to combine them. I'll explain how to merge the two images in a way that our visual system finds believable in chapter 6

Similarly, if you fill the frame with a dark subject, such as dark rock or a black bear, and use the exposure recommended by the meter, you will get a gray rock or gray bear.