Methods and apparatus for halftoning continuous-tone images
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United States of America Patent
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Jun 10, 2014
Grant Date -
Aug 8, 2013
app pub date -
Feb 7, 2012
filing date -
Feb 7, 2012
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Abstract
A method of halftoning a continuous-tone image includes the step of expressing a transition tone intensity by a maximum population density of halftone dots equal in size and having a transition dot size. Expressing tone intensities darker than the transition tone intensity includes increasing dot sizes beyond the transition dot size of the maximum population. Expressing tone intensities lighter than the transition tone intensity includes using a population density lesser than the maximum population density, and each relatively darker tone includes a relatively smaller dot size and a relatively larger population density than each relatively lighter tone.
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