A method for developing calibration curves and for calibrating a halftone imaging device to reproduce on an imaging medium gray scale values equal to input gray scale values entered in said imaging device. According to this method a calibration function representing a linear change in reproduced halftone dot size on said imaging medium as a function of input halftone dot size is developed by using the device to reproduce on an imaging medium at least two test input dot values representing two different % halftone dot sizes and determining a linear change between the input and the reproduced halftone dot sizes. The dot growth is used to predict dot changes for other % halftone dots and thus construct calibration curves which may be used to calibrate the imaging device.
There are provided an image processing apparatus and an image processing method which are capable of correctly determining the scaling factor of an input image containing a specific image composed of a predetermined number of partial images. When an input image is inputted, the partial image detection unit 1 detects information about partial images. As information about partial images, information indicating whether partial images exist, the size of the partial images, and the like are outputted. The information about partial images is outputted for each pixel of an input image and a pattern composed of the information about partial images is obtained. The scaling factor estimation unit 2 uses a pattern composed of the information about partial images outputted from the partial image detection unit 1 to detect an area where a predetermined number of partial images exist, and determines the scaling factor of the input image from information of the area.
A method and system for calibrating a device having a first fluid source that ejects a first drop quantity and a second fluid source that ejects a second drop quantity by, for example, printing a pattern having a first portion and a second portion; obtaining a relationship between the first drop quantity and the second drop quantity from the pattern; and adjusting data used to determine quantities of fluid to eject from the first or second fluid sources based on the relationship between the first and second drop quantities. Other embodiments of the invention are directed to a calibration apparatus and system.
A printing method identifies where parts of an image will not be printed correctly due to partial or total device failure and if possible adjusts the size of ink dots in adjacent rows or columns so as to lessen the visual effect of failure to print at the original location.
A printing method identifies where parts of an image will not be printed correctly due to partial or total device failure and if possible adjusts the size of ink dots in adjacent rows or columns so as to lessen the visual effect of failure to print at the original location.
A method for operating an inkjet printer configured to print an array of rows and columns of dots includes monitoring for incorrectly printed columns. The operation of correctly operating nozzles neighboring incorrectly operating nozzles associated with the incorrectly printed columns is modified in a compensatory manner. The step of modifying the operation of correctly operating nozzles includes increasing the duration on heating current pulses delivered to the correctly operating nozzles.
