The latest version of the raw file processor included with Photoshop is so powerful that most photos can be processed entirely in the raw processor, with no need for further editing in Photoshop. And by making your adjustments in Adobe Camera Raw, rather than in Photoshop, you’ll ensure the best possible image quality, because raw files contain more picture information than bitmap images such as un-layered PSDs and JPEGs. Here’s our reference to the features you’ll use the most in the Basic panel.
THE BASIC PANEL IN ACR