Drop a plate here
A scan of a sequential photography plate (JPEG or PNG, or a page of a PDF). You mark each row, fix each frame's corners, and export transparent PNG sequences with the print's real edges.
Everything stays in your browser and is saved per plate.
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The outgoing row's last frame, with the incoming row's first frame on top. Arrow keys move the incoming row and everything after it (Shift: 10px). In Difference, lined-up areas go dark.