Coordinates

Capture uses display-local logical points with top-left origin. Query displays every session; IDs are machine-specific. The returned backing scale converts point dimensions to captured pixels. A window can cross displays: choose the display with the largest intersection and clip the rectangle to it.

Offline marks and crop use source-image pixels, also top-left origin. Crop is validated against the source image. Do not reuse capture-point coordinates as image pixels on Retina displays. Other windows, animation, and layout changes can still affect capture.