A system of lines forming small squares of standard size, which is photographed, by a separate exposure, on the same plate with star images to facilitate measurements, detect changes of the film, etc.

Within the optics of the Voyager cameras was a grid of black dots called "reseau markings." These appear superimposed upon each image sent back from Voyager, and are used to correct for geometric distortions in the camera. They are often suppressed in published images by replacing them by the local average brightness. Nevertheless, you can almost always find them if you look closely. Back to the .

A grid of points or marks placed in a photograph by a transparent plate very carefully and precisely aligned with the camera's optics. This provides a stable and reliable basis for measuring objects in a photograph and for detecting and correcting distortions in the photograph. The Hasselblad 70mm cameras used on the moon were fitted with reseau plates.

See lace.

a net or mesh foundation for lace

A network;