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The primary purpose of Photoshop is to act as a digital darkroom where images can be corrected, enhanced, and refined. How do you know an image needs touch-up? You can pretty much assume every image can look a little (or even a lot) better than how the camera captured it. Whether it’s adjusting the exposure, increasing contrast, or boosting saturation, Photoshop is the place to improve an image.
Learning how to spot problems and then choosing the right correction technique is an essential part of mastering Photoshop. Several different tools are available, some more useful than others. By analyzing the most important tools and determining in which situations they might help you, a more thorough understanding of color correction is possible.