In printing, the reproducibility of printed dot size is important. The reproducibility of dot printed by electrophotography printing, offset printing, and flexography is investigated. It is found that the variation of dot by flexography is 0.046 in the mid range density level, on the other hand the variation of offset printing is 0.023. The variation of dot by electrophotography printing is 0.043. The relation between the variation of the dot size and quality of uniform density shows that human can detect the quality of uniform density on produced by flexography and electrophotography easier than offset printing.
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