Image viewer

open <image> shows an image in its own tab — all the common formats work: PNG, JPEG, GIF, WebP, BMP, SVG, AVIF, ICO.

open diagram.png

The tab shows a compact header with the file's name, size, and location, and the image fills the space below, fit to the tab: a landscape image spans the full width, a portrait one the full height. The tab is labeled image in the strip (the filename is in the header) and carries a × close button.

Zoom and pan

Control	Action
PageUp / scroll wheel up	Zoom in, 10% per step
PageDown / scroll wheel down	Zoom out, 10% per step
Escape	Reset to 100% and center
Arrow keys	Pan (hold to keep panning)
Click and drag	Pan freely

100% is the fit-to-tab size; zoom runs from 10% to 800%. While zoomed away from 100%, the current percentage is shown on the view. There are no scrollbars — reaching the out-of-view parts of a zoomed image is what panning is for. Panning with a held arrow key is continuous, and dragging follows the mouse.

Lifecycle

An image tab is a live view, not saved state: zoom and pan reset when you switch away to another image tab, and image tabs are not restored by janus --relaunch. Closing one — via its × button or close — just removes the view; the file is untouched. Only files you've explicitly opened are ever served to the viewer.

To hand an image to the OS viewer instead, use open external <image> — see Opening files and pages.