R.r. Donnelley and Sons Company

Edward G Pariser

J Thomas Shively

A method of calculating engraving parameters for a gravure cylinder at a desired raster, cell shape and stylus angle given an estimate of the engraving parameters. The method includes inputting a set of initial parameters including an initial raster, an initial cell shape, an initial stylus angle, an initial highlight width, an initial shadow width, an initial channel width and an initial space. The method proceeds by calculating an initial value of a cell volume from the initial parameters. Next, a set of new parameters are inputted including a desired raster, an estimate of a desired highlight width, an estimate of a desired shadow width, an estimate of a desired channel width and an estimate of a desired space. Then, a new value of the cell volume is calculated from the new parameters. Using the volume calculation, the method can be used to: calculate a set of engraving parameters for a gravure cylinder at a new ink cut, calculate the amount of ink solution that a given gravure cylinder will use in making a specified number of impressions, determine the total cost associated with making a specified number of impressions and determine the optimal cell geometry for a gravure cylinder.

Methods of determining gravure cylinder parameters

A method and apparatus converts from a color appearance space to a colorant space and determines quantities of colorants required to reproduce a color in a medium. A set of input color signals representing a desired or measured color in the color appearance color space is developed and compared to a set of calculated color signals, representing an estimate of the color in the color appearance space, to produce an error signal. A set of scan estimate signals representing color components are generated and converted into a set of colorant estimate signals which represent quantities of colorants in the colorant space required to reproduce the color estimate in the medium. The set of colorant estimate signals are mapped into the color appearance space, according to the characteristics of an output device which is to reproduce the color in the medium, to produce the set of calculated color signals. The set of scan estimate signals are iteratively altered in response to the error signal to develop a set of calculated color signals which approximates the set of input color signals according to an error criterion.

Growing community of inventors

Oak Park, IL, United States of America

Edward G Pariser