Posterization: Darkroom techniques which turn the continuous tones of a photograph into three or four flat tones; to produce a picture resembling a poster. Also called tone separation.
海报化：把连续色调的相片用黑房技巧转为三至四个平调，造成像海报的图画的情况。亦称色调分离。
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The artistry of Dufu's expression in his poetry is abundant. I try to analyse its three aspects in the paper, namely, the self-separation, the picture with plenty meaning, the contrast.