Interpolation of greyscale levels
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United States of America Patent
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Aug 20, 2002
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N/A
app pub date -
Sep 14, 1998
filing date -
Mar 18, 1996
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Expired
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Abstract
In a method of colour printing using arrays of threshold value for interpolating between grey levels, the threshold values for each of the colours are provided by defining rows of threshold values, with each row having the same repeating sequence but offset. The repeating sequences are different for each colour but the offset is the same for all colours. The arrays best take the form T.sub.ij.sup.c =(i*p.sup.c -j*q.sup.c)%(r.sup.c S).
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