BEIJING, Oct. 20 (Xinhua) -- "Liberated China," one of China's first color documentaries, has been digitally restored by the China Film Archive (CFA).

With a length of 89 minutes and about 130,000 frames, the documentary was jointly shot by two crews from the Soviet Union and the Beijing Film Studio from September 1949 to 1950, recording historic events around the founding of the People's Republic of China (PRC), including the founding ceremony of the PRC, and was thus dubbed by many as a national treasure among documentaries.

To mark the 70th anniversary of the founding of the PRC, the restoration crew from the CFA took nine months to complete the digital restoration of the documentary based on its original film.

It was part of a digital restoration program launched by the CFA in 2006, which saw around 150 films restored on average per year, while 535 have been restored in a resolution of 2K and above, said Zhang Xiaoguang, deputy head of the CFA.