SNAPSHOTS & HISTORY
The Snapshot tool lets you capture an image in its current state, with all of the adjustments you've made so far. If you make more adjustments and then you decide you want to revert to that earlier state, your snapshot takes you back in time effortlessly. You also can step backward with the traditional History palette.
These controls let you change your view of the image for side-by-side or split-image before-and-after views. Soft Proofing gives you an approximation of how your image will be reproduced in different color spaces.
The photos from your most recent import are shown here for easy navigation of your latest project.
Workflow in Photoshop Lightroom is presented in step-based modules. Selecting a module here changes the tool palettes to focus on a specific task, whether that be importing, enhancing or exporting your images.
The Develop module is probably where you'll spend most of your time, as you make enhancements to your images here. Below the Histogram display are icons that let you select tools for cropping, removing red-eye, adding a graduated filter or making localized adjustments with a brush. Below that, a scrolling palette offers many global adjustments, covering everything from basic exposure controls to sharpening, noise reduction, lens corrections and more.