Ghost Overlay (Onion Skin) and Custom Reference Guides inside the Crop Tool

Hi Adobe Lightroom Team,

I am a dentist, and I use Lightroom (Cloud version) daily to manage and edit the clinical photography and documentation of my patients.

In dental documentation, precision is vital. For every patient, I take standardized photos from multiple angles—including frontal and profile facial views, smile close-ups, and intraoral arches. To analyze treatment progression, orthognathic alignment, or orthodontic evolution accurately, all of these photos must be aligned perfectly frame-by-frame.

Currently, doing this in Lightroom Desktop is an exhausting, imprecise guessing game using the standard crop grid and its variations. It is highly frustrating and inefficient for clinical standards.

I want to make it absolutely clear: I do not want to constantly switch between different programs (like Photoshop) just to achieve a simple alignment. Lightroom should be able to handle this natively.

We urgently need a "Ghost Overlay" (Onion Skin) or a "Custom Reference Guide" inside the Crop Tool. It should allow us to:

1. Lock a reference photo (like the patient's initial frontal view) as a semi-transparent layer over the current image while cropping.
2. Draw or place custom static contour lines (like a custom midline or bipupillary line grid/eye position) to anchor the patient's eyes, nose, and teeth across different frames.
3. AI-Powered Contour Outlines: Since Lightroom already has advanced AI subject masking, it could generate a vector-like contour outline of specific tracked elements (such as a single tooth, a group of teeth, eyes, or facial silhouette) from a reference photo. This AI outline could then remain fixed on the screen as a transparent target guide while we adjust and crop subsequent photos.

Beyond dental and medical professionals, this feature would be immensely valuable for photographers and videomakers. It would allow perfect alignment of subjects for composite photography, time-lapses, and seamless video scene transitions directly within the platform.

This is a simple yet crucial tool for dental and medical professionals who rely on Lightroom for serious documentation. Please implement this in the next update.

Best regards,
André Royer