反色
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reversed color addition 反色相加
reversed color
以上为机器翻译结果，长、整句建议使用 人工翻译 。
When the footage was first shot, each frame was run consecutively through red, green or blue gels, and the process needed to be reversed during projection to reveal the color.
ENGADGET: World's oldest color film footage discovered in museum archive (video)
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