Method for compensating for printer characteristics
First Claim
1. A method for compensating for printer characteristics having a tone reproduction curve which is either too rough to be fitted by interpolation or which does not have a simple parametric function, comprising:
- a) placing a first set of control points on said tone reproduction curve;
b) fitting a first smoothed curve to said first set of control points;
c) moving a subset of points belonging to the set of first control points along the first smoothed curve;
d) generating a second set of control points comprising the moved first control points and the remaining unmoved first control points;
e) fitting a second smoothed curve to said second set of control points;
f) determining a differential function between the first and second fitted curves; and
g) adding said difference to the original curve to produce a smoothly modified last curve, which retains the original curve'"'"'s characteristics.
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Accused Products
Abstract
What is disclosed is a method for compensating for printer characteristics having a tone reproduction curve which is either too rough to be fitted by interpolation or which does not have a simple parametric function. The method comprising first placing a first set of control points on the tone reproduction curve such that each point is representative of the behavior of the curve in the vicinity of that point and fitting a first smoothed curve to the first set of control points. A subset of points belonging to the set of first control points along the first smoothed curve is moved, thereby indicating a desired change in that region of the curve of the original function. A second set of control points is generated from the set of moved first control points and the remaining unmoved first control points and a second smoothed curve is then fitted to the second set of control points. A differential function between the first and second fitted curves is then determined. This difference is added to the original curve to produce a smoothly modified last curve, which retains the original curve'"'"'s characteristics.
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Citations
7 Claims
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1. A method for compensating for printer characteristics having a tone reproduction curve which is either too rough to be fitted by interpolation or which does not have a simple parametric function, comprising:
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a) placing a first set of control points on said tone reproduction curve; b) fitting a first smoothed curve to said first set of control points; c) moving a subset of points belonging to the set of first control points along the first smoothed curve; d) generating a second set of control points comprising the moved first control points and the remaining unmoved first control points; e) fitting a second smoothed curve to said second set of control points; f) determining a differential function between the first and second fitted curves; and g) adding said difference to the original curve to produce a smoothly modified last curve, which retains the original curve'"'"'s characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification