Reducing quantization errors in imaging systems
First Claim
1. A method comprising:
- generating a first set of color values in a first color space;
dithering said first set of color values to generate second sets of color values; and
transforming said second sets of color values to a second color space in a display system to approximately reproduce said first set of color values.
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Abstract
A technique is described to greatly reduce or avoid the quantization errors that occur when mapping a relatively linear RGB color space into a greatly non-linear printer CMY color space of equal precision, avoiding the contouring or banding that occurs when printing color gradients in a non-linear printing system. The technique performs a dither-like process on the original RGB continuous tone data. The RGB values are dithered to create a range of values that, when mapped to the non-linear printer continuous tone CMY values, creates a range of CMY values that, on average, represent the correct average tone of the input RGB values. The generated CMY continuous tone values are then halftoned and printed.
16 Citations
23 Claims
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1. A method comprising:
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generating a first set of color values in a first color space;
dithering said first set of color values to generate second sets of color values; and
transforming said second sets of color values to a second color space in a display system to approximately reproduce said first set of color values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus comprising:
a dithering device having as inputs a first set of color values in a first color space, said dithering device outputting second sets of color values for a first set of color values; and
a transformer receiving said second sets of color values and transforming said second sets of color values to a second color space for being displayed in a display system.- View Dependent Claims (19, 20, 21, 22, 23)
Specification