Compare

The compare view shows two or four photos side by side, so you can pick the best shot of a series and reject the rest, using only the keyboard.

Opening it

In the Library, press C (or click Compare above the timeline):

• with two or more photos selected, they are compared in timeline order;

• otherwise, the series of the selected photo (or the photo in the loupe) is compared, best-ranked photo first (Series), each with its ranking score.

The view starts in 4-up when there are more than two photos, else 2-up, with the selected photo active. The active photo has a white outline; every key below applies to it.

Keys

Key	Action
← →, Home / End	Make the previous / next, first / last photo active. When there are more photos than panes, the panes scroll to keep the active one in view.
L	Switch between 2-up and 4-up
P, X, U	Pick, reject, unflag
0 – 5	Rate (0 clears)
B	Make the photo the best of its series; again to withdraw the choice
Z	Zoom every pane to 100%, or back to fitted
Shift + arrows	Pan all zoomed panes together
Ctrl+Z, Ctrl+Shift+Z	Undo, redo (shared with the timeline)
Esc	Leave zoom; close the view

With the mouse: click a pane to make it active, double-click a point to zoom there, drag or scroll a zoomed pane to pan. Zoom and pan are synchronized: every pane shows the same part of its photo (as a fraction of the photo’s size), so you can compare focus on the same eye in each shot.

Rejected photos are dimmed and labelled; picks, stars and the best photo are shown under each pane. Closing the view selects the active photo in the timeline, and every change is already saved.