So far I have shown just how much can be done to improve an image when editing it in Camera Raw, before you bring it into Photoshop. Some of the techniques described in this chapter may appear to overlap with Camera Raw editing, but image adjustments such as Levels and Curves still play an important role in everyday Photoshop work. This chapter also explains how to work with photos that have never been near Camera Raw, such as images that have originated as TIFFs or JPEGs. I’ll start off by outlining a few of the fundamental principles of pixel image editing such as bit depth and the relationship between image resolution and image size. After that we’ll look at the main image editing adjustments and how they can be used to fine-tune the tones and colors in a photograph.