National Geographic : 1966 Oct
Moon's gray pallor contrasts with color targets attached to Surveyor in these epoch-making photo graphs. The craft snapped color pic tures of the moon, but not on color film. In stead, its camera shot three separate pic tures of each scene through orange, green, and blue filters. Working under the supervision of JPL scientists, the Geo graphic's color laboratory took the separation negatives transmitted from the moon and printed them through filters onto one piece of color film. Close-up at right shows a gold-plated jet noz zle that appears yellow against Surveyor's white frame. Magenta tint came from failure of the camera's green filter to register properly. Photo metric disks, identical to one at JPL (inset), pro vided the guide for reconstituting the color. Sub tle color differences between small features help geologists interpret the moon's surface structure.