| 摘要 |
A practice for producing a halftone reproduction wherein a predetermined screen function is used to process the gray levels of the scanned original and wherein the halftone reproduction is made capable of exhibiting gray levels over the entire gray tone range of 0 (black) to 255 (white) by selecting the screen frequency in the screen direction so as to result in a screen frequency in the print direction which is other than a sub-multiple of the print frequency.
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