The Grader UI

A fast, keyboard-driven UI for reviewing and grading subs. It's the same UI everywhere: the desktop app ships it built in (no server or browser needed), and psf-guard server serves the identical interface to any browser for NAS and remote setups. Grades are written straight to the Target Scheduler database, so acquired-image counts stay accurate and rejected frames get re-shot.

Overview dashboard

The overview aggregates all your configured scheduler databases: project and target statistics, completion percentages, real-time file discovery status, and filter usage. Click through any project or target to land in its grid.

Image grid

• Smart filtering — project, target, grading status, date range.
• Batch operations — multi-select with Shift+Click / Ctrl+Click, then accept, reject, or unmark the whole selection.
• Metadata on every card — HFR, star counts, acquisition details.
• Smart loading — fast previews first, full resolution on zoom. Previews generate on demand in the background, so a fresh install is browsable immediately; a "Generating…" badge shows while the queue works.

Comparison mode

Put two frames side by side with synchronized (or independent) zoom and pan — ideal for judging a borderline frame against a known-good neighbor. Accept, reject, or unmark both images at once.

Sequence view

The Sequence view plots per-frame quality over a night: HFR, star counts, and — once you press Scan Occlusion — the spatial and photometric screening signals. Flagged runs are classified (occlusion, clouds, sky brightening) and can be bulk-selected for rejection. See Quality Screening for how the signals work.

Keyboard shortcuts

Where grades go

Every action updates gradingStatus in the Target Scheduler database (with undo/redo tracked in the UI). Because the scheduler counts accepted images against each exposure plan, rejecting bad frames means the scheduler queues replacements on the next imaging run — closing the loop between grading and acquisition.