NASA Color Trick Unearths Hidden Rock Art on Earth
Archaeologist Jon Harman adapted NASA's decorrelation stretch—a color-enhancement method based on the Karhunen–Loève Transform—into the Dstretch plugin to sharpen rock-art photos. The technique has revealed previously unseen figures, including a yellow figure in Baja California and dozens more at sites like Angkor Wat and Beni Hassan, illustrating how space-age image processing can illuminate ancient art on Earth.
