问题描述：
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the blue filter produces a negative record of the blue in the subject. the positive is a record of color that absorbs blue, which is yellow. this positive is the yellow printer, and the negative is the blue separation or the yellow negative.
the three colors, yellow, magenta, and cyan, are the colors of the inks for process color reproduction. they are the subtractive primaries, because each color represents two additive primaries which are left after one primary has been subtracted, or absorbed, form white light.
the blue filter produces a negative record of the blue in the subject. the positive is a record of color that absorbs blue, which is yellow. this positive is the yellow printer, and the negative is the blue separation or the yellow negative.
the three colors, yellow, magenta, and cyan, are the colors of the inks for process color reproduction. they are the subtractive primaries, because each color represents two additive primaries which are left after one primary has been subtracted, or absorbed, form white light.
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