You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.
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那时候的邮轮，才可能真正在中国扎根，成为大众旅游消费中一个常态化的选项。
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