For most people, a slide and negative scanner can be used to preserve family memories. But in Hollywood, they are using tools more advanced than the average 35mm slide scanners to save memories of a different kind: film classics.

In late September, a newly-restored version of “The Wizard of Oz” debuted on DVD on Blu-Ray. In addition, movie theaters around the country screened the new version of the 1939 family classic to packed houses. The new version was done to commemorate the film’s 70th anniversary.

According to the Los Angeles Times, restoration work involved a pin-registered digital film scanner scanning three separate film negatives at 8k, a much higher resolution than was previously possible.

“In finding the 1939 nitrate Technicolor print, we got a different look for the film than we previously had,” says Ned Price, vice president of mastering at Warner Bros. Technicolor Operations. “The information allowed us to get not only finer picture detail but much better grain capture.”