“There will be a lot of hand, manual repair on the original film copies, using tape to make sure the films can pass through cleaning machines, and also through the scanner,” said Kieron Webb, the archive's film conservation manager.
The team used the original camera negative of Shiraz, along with a copy made decades later, which were combined digitally to obtain the best images and restore tens of thousands of frames.
“The removal of scratches and dirt; de-flicker, which makes the image look more stable; reduce the light and darkness changes in some shots,” said Webb, summarising hundreds of hours of work.
Ben Thompson, an image quality section leader, demonstrated how to remove a scratch from a Shiraz scene without accidentally brushing out a horse's leg.
Restorers have also sharpened the images, which Thompson said creates more work: "As soon as you improve the sharpness of the image it reveals, brings into sharp focus the detail but also the defects." Digital techniques, which have replaced much of the old photo-chemical processes, have enabled restorers to become more precise in their work and upgrade every single shot in a film such as “Shiraz”.
'A fantastic record'
The Indian film is nearly 90 years old but BFI also holds films going as far back as the 1890s. Despite the films' age, curators said they were easier to restore due to their brevity.
"Some of them are only a minute long," Dixon said.
“With the 1920s it gets much more complex, because the films get longer and they have a grammar to them which means if you're missing part of the film print, you have to sort of compensate in order to make it understandable for the audience.” Colour and sound add further layers of complexity, although silent films are themselves problematic because they often lack any documents to dictate the speed they should be shown at.
Restoration is a costly endeavour and the archive relies on public funds and private donors, as well as ticket sales from screenings.
But the restorers say the cultural value is boundless, giving audiences a window into an unseen age and places that have since disappeared.
“Fiction film, or non-fiction film, is this fantastic record of the whole of the 20th century that people can look at... It is, for those that care to look, a real experience,” said Dixon.