Book excerpt: Exposure. It’s essential to producing high-quality photographs, but mastering exposure is difficult. At last there’s a BetterPhoto guide to exposure, packed with BetterPhoto’s signature assignments, diagrams, tips, and illustrations. It’s like a full-scale photography course between the covers of the book–all taught the BetterPhoto way, just like photographers learn at the top photography-instruction site on the web. There’s plenty of information here on both digital and film photography, discussing how different file formats affect exposure, how to adjust digital files, color correction, combining digital exposures, and much more. The author’s stunning full-color photographs make this hardworking guide as inspiring as it is instructive.