Ever wonder what your Lightroom adjustments will look like without applying them? Instead of applying and undoing, next time hold the “Alt” (Windows) or “Option” (Mac) key to get a preview of what adjustments will do to your photograph. In the Basic panel, it’ll show problematic highlights and shadows so you can further edit, while the Split-Toning, Detail and Camera Calibration panels will show previews of what the adjustments will do to your image.