As the little brother to Photoshop, Lightroom isn’t always known for the robust editing features of Adobe’s ubiquitous editing application. That said, however, Lightroom does offer tools that are uniquely its own and which in some cases do things in a simple and elegant manner that even Photoshop can’t quite match. A prime example of this is Lightroom’s easy-to-use Loupe Overlay tool. It’s a great way to measure and align the positioning of elements within an image.
Loupe Overlay is found in Lightroom’s View menu, down toward the bottom of the list. There you’ll find three primary options under the Loupe Overlay heading: Grid, Guides and Layout Image. Here’s how they work.
Loup Overlay — Grid
Grid provides a simple screen overlay with intersecting horizontal and vertical lines that form an adjustable grid. This is a great way to ensure right angles are correct, and vertical and horizontal lines are straight and free of visual distortion. The size and opacity of the grid lines are changed by holding the control key (or command key on a Mac) and clicking and dragging on the Size and Opacity options that appear.
A higher opacity will make the grid lines look more opaque and bold, while the size slider adjusts the lines to be closer together, producing much smaller boxes within the grid. For finer measurements, a smaller grid will be more appropriate, while lines farther apart will work for most general measures and to check the alignment of larger image elements.
Loup Overlay — Guides
I find grids to be more useful for general-purpose alignment issues, but for those who want to precisely gauge the placement of an element within a scene, or to align two image elements on a single axis, the Guides loupe overlay may be even better. Clicking on Guides in the Loupe Overlay menu brings up a pair of lines on the screen, horizontal and vertical, which intersect at the exact center of the frame.
By default, this is a great way to determine the precise center of a composition, but then by holding the Command key (or Control in Windows) you can click and drag the position of the intersection to anywhere in the frame. This allows you to align text, for instance, or to adjust the rotation of the canvas to ensure elements are perfectly aligned on horizontal or vertical axes. Holding the Command/Control key and double-clicking at the intersection of the lines resets the guides and moves them back to the exact center of the frame. And if you’d care to, you can have both guides and grid lines visible on the screen at the same time, just by clicking to activate both in the Loupe Overlay menu.
Loup Overlay — Layout Image
Perhaps the most interesting and useful tool of Lightroom’s Loupe Overlays is the Layout Image option. By clicking this menu heading, you’ll be prompted by Lightroom to choose an image to be applied atop the photo being viewed in Lightroom. It’s not making layers but rather providing a sort of reference mask through which you can view a photo. The most practical use of this Layout Image tool is to combine text or a page design to the image in order to ensure image elements fit and work well in the layout. And it’s incredibly helpful—as are all the Loupe Overlay tools—when shooting with tethered capture to ensure images and elements within are aligned as needed.
In practice, any transparent PNG file can be used as the layout image. To modify the intensity of the matte that appears outside of the transparent design image, hold the Control key (or Command on a Mac) and click and drag left and right on the Matte value that appears. You can also adjust opacity this way in order to make the text or design elements in the layout image more transparent. However you employ it, it’s an incredibly useful tool that works quite simply and gives Lightroom users more control over the alignment of the elements within their shots.