Archives For space

Benson works hard on NASA  images by combining multiple images and adding color.

“The process of creating full-color images from black-and-white raw frames—and mosaic composites in which many such images are stitched together—can be quite complicated,” Benson writes. “In order for a full-color image to be created, the spacecraft needs to have taken at minimum two, but preferably three, individual photographs of a given subject, with each exposed through a different filter… ideally, those filters are red, green, and blue, in which case a composite color image can usually be created without too much trouble. But in practice, such spacecraft as the Cassini Orbiter or the Mars Exploration Rovers … have many different filters, which they use to record wavelengths of light well outside of the relatively narrow red, green and blue (RGB) zone of the electromagnetic spectrum that human eyes can see.”