Once you've decided which photograph is the better of the two, you can apply attributes (graphic labels that define a certain characteristic) so that later you can filter and find the photos that fit your specific criteria. There are several ways to apply attributes in Lightroom, but as part of this workflow, the easiest way is to use the buttons along the bottom of the Select and Candidate previews. Look between the previews and the zoom controls for a gray bar (see Figure 4). This bar contains all of the attribute controls for flagging, rating, and labeling a photograph.
Figure 4 With the attribute controls along the bottom of each image preview, you can quickly assign visual labels indicating that images have been flagged, rated, and labeled.
At left are two small flag icons. The plain flag typically represents an image that has been selected for further review or editing, while the (black) flag with the x inside it signifies an image that has been rejected for quality issues. At the center of the gray bar is a simple (star) Rating widget, with five dots. Each dot represents a star value when clicked. At the right end of the gray bar is a label pop-up menu. These labels are used to organize images by color; the meaning of the color is up to you, but you can assign different meanings from one shoot to the next.
Once the photo's attributes are applied and you jump back to the Grid view by pressing the G key, your specified attributes are displayed on the grid cells (the gray area around each thumbnail), as shown in Figure 5. These attributes can be used as the basis for sorting the Grid view, but the most useful way to leverage the power of attributes is by using the Library filter, covered in the next section.
Figure 5 After attributes are applied to a series of images, they are easier to find, sort, and filter. Notice the Library filter controls (above the thumbnails); I'll discuss the use of those controls in the next section.