Picture producing apparatus using picture information values correlated to light intensities in tonal conversion formula
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United States of America Patent
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Dec 10, 1991
Grant Date -
N/A
app pub date -
Mar 7, 1991
filing date -
Mar 8, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A picture producing apparatus which produces a reproduced picture having a middle tone on a recording sheet based on signals, by obtaining density information values of respective pixels on an original picture from a medium image recorded on a predetermined recording medium, and processing the density information values in a tone adjusting means to obtain the signals. The tone adjusting means conducts the steps of converting the density information values (D.sub.n values) of the respective pixels on the original picture, by using a density characteristic curve defining a relationship between density information values (D values) of the recording medium and picture information values (X values) correlating to incident light intensity from the original picture into the recording medium, into picture information values (X.sub.n values) correlating to light intensity corresponding to the density information values (D.sub.n values) of the respective pixels, and converting the picture information values (X.sub.n values) correlating to light intensity into tonal intensity values (y values) for tone adjustment by operating a specific tonal conversion formula: ##EQU1##
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