Film colorization (American English; or colourisation [British English], or colourization [Canadian English and Oxford English]) is any process that adds color to black-and-white, sepia, or other monochrome moving-picture images. It may be done as a special effect, to "modernize" black-and-white films, or to restore color films. The first examples date from the early 20th century, but colorization has become common with the advent of digital image processing. Early techniques Hand colorization The first film colorization methods were hand done by individuals. For example, at least 4% of George Méliès' output, including some prints of A Trip to the Moon from 1902 and other major films such as The Kingdom of the Fairies, The Impossible Voyage, and The Barber of Seville were individually hand-colored by Elisabeth Thuillier's coloring lab in Paris. Thuillier, a former colorist of glass and celluloid products, directed a studio of two hundred people painting directly on film stock with brushes, in the colors she chose and specified; each worker was assigned a different color in assembly line style, with more than twenty separate colors often used for a single film. Thuillier's lab produced about sixty hand-colored copies of A Trip to the Moon, but only one copy is known to still exist today. The first full-length feature film made by a hand-colored process was The Miracle of 1912. The process was always done by hand, sometimes using a stencil cut from a second print of the film, such as the Pathécolor process. As late as the 1920s, hand coloring processes were used for individual shots in Greed (1924) and The Phantom of the Opera (1925) (both utilizing the Handschiegl color process); and rarely, an entire feature-length movie such as Cyrano de Bergerac (1925) and The Last Days of Pompeii (1926). These colorization methods were employed until effective color film processes were developed. Around 1968-1972, black-and-white Betty Boop, Krazy Kat and Looney Tunes cartoons and among others were redistributed in color. Supervised by Fred Ladd, color was added by tracing the original black-and-white frames onto new animation cels, and then adding color to the new cels in South Korea. To cut time and expense, Ladd's process skipped every other frame, cutting the frame rate in half; this technique considerably degraded the quality and timing of the original animation, to the extent that some animation was not carried over or mistakenly altered. The most recent redrawn colorized black-and-white cartoons