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Quick answer：The term 'Gu Gong Tun Se LR' seems to refer to a digital photography technique or filter applied to images taken at the Forbidden City (Gu Gong), which is a historical imperial palace complex in Beijing, China. 'Tun Se' likely means color tuning or adjusting the color tones, while 'LR' could stand for 'Lightroom', a popular photo editing software. This could imply the use of Lightroom adjustments to alter the color tones of photographs taken at the Forbidden City.
