Method for Assigning Pre-Press Curves
AssigneeEsko IP NV
InventorMark Samworth
Life of this patent
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Abstract
A method for adjusting color tones of an input digital image file to create an adjusted digital image file. A plurality of predetermined curves are provided, each curve specifying an adjusted color tone percentage output as a function of input color tone percentage and representing a combination of midpoint magnitude and contrast different than for any other curve. The method comprises selecting a curve by determining which one of the plurality of curves most closely matches at least two data points. The selected curve is then applied to the input digital image file to produce the adjusted digital image file.
Claims22
A method for adjusting color tones of an input digital image file to create an adjusted digital image file, the steps comprising:
- a) providing a plurality of predetermined curves, each of said curves specifying an adjusted color tone percentage output as a function of input color tone percentage over a range of input and output values, each of said curves reflecting a midpoint magnitude and contrast over the range of input and output values, the midpoint magnitude comprising the adjusted color tone percentage output corresponding to an input color tone percentage of 50%, each curve representing a combination of midpoint magnitude and contrast that is different from the combination for any other curve in the plurality of curves;
- b) providing at least two data points, each data point comprising an adjusted color tone percentage output corresponding to an input color tone percentage;
- c) determining which one of the plurality of predetermined curves most closely matches said at least two data points, thereby identifying a selected curve;
- and
- d) applying the selected curve to the input digital image file to produce the adjusted digital image file.
A computer programmed with instructions for adjusting color tones of an input digital image file to create an adjusted digital image file, the computer comprising:
- a) means for storing a plurality of predetermined curves, each of said curves specifying an adjusted color tone percentage output as a function of input color tone percentage over a range of input and output values, each of said curves reflecting a midpoint magnitude and contrast over the range of input and output values, the midpoint magnitude comprising the adjusted color tone percentage output corresponding to an input color tone percentage of 50%, each curve representing a combination of midpoint magnitude and contrast that is different from the combination for any other curve in the plurality of curves;
- b) means for receiving an input of at least two data points, each comprising an adjusted color tone percentage and an input color tone percentage;
- c) means for determining which one of the plurality of stored predetermined curves most closely matches said at least two data points, thereby identifying a selected curve;
- and
- d) means for applying the selected curve to the input digital image file to produce the adjusted digital image file.
Dependencies are inferred from the claim text.