A method of predicting and processing image fine structures which, by simulating the interference-generated image fine structures with a continuous-tone printer or a display, enables the image fine structures to be predicted as faithfully as can be achieved by high quality machines without sacrificing the advantages of the continuous-tone printer or display (i.e., convenience in handling and the low costs of materials and machine), thus ensuring that moire, line discontinuities, imperfections in straight lines and other image fine structures that will appear in a printed document can be predicted on a hard or soft proof in an accurate and convenient way within a short time, and which also ensures that the intensity of moire and other peculiar patterns that occur can be freely adjusted in accordance with the type of the printing machine to be used. The pixel values of the original image separated into pixels for each of the CMY or CMYK plates are converted to pixel values for predicting image fine structures which will appear in a printed halftone image, characterized in that the values of the pixel to be converted and neighboring pixels are subjected to weighted averaging with adjustable weights dependent on the period of grid units that is determined by the screen ruling and screen angle for said printed halftone image.
An original reference value table containing converted values of image data on the entire color space is made based on known look-up tables of a printer and a correction printer, and a reference value table is wholly or partly corrected adequately so that the results of printing performed by the correction printer by referring to the original reference value table may be similar to the results of printing performed by the printer while the mutual non-linearity of converted values held in the reference value table is maintained, thus making a reference value table with an improved precision of color reproduction.
By using negative feedback, moire patterns can be reduced, or virtually eliminated, from input black-and-white or color original images. In particular, by feeding back an image containing the difference between the original input image and the halftone output with possible moire patterns, and subtracting the low-frequency part of this image from the original input image, a resultant halftone image can be achieved that has reduced moire patterns.
A method of predicting colors resulting from using one ink on a printer. The method includes the steps of: producing a test page for the printer, the test page having a plurality of sample ink patches, each patch having a plurality of ink dots according to a predetermined ratio for each patch, the predetermined ratios being based on a number of dots printed for a corresponding patch compared to a maximum number of dots; measuring each of the sample ink patches to produce a plurality of color space coordinates for each patch; and fitting values representing a number of dots for each patch and color space coordinates to a plurality of predetermined functions using a minimization process in order to predict the colors.
An apparatus and method for allowing color adjustments in display devices is disclosed The apparatus comprises a multi-resolution structure for providing color adjustments; and an interpolator for interpolating at least one offset of the multi-resolution structure. An apparatus and method in accordance with the present invention uses a combination of color look-up tables with different levels of resolution, followed by interpolation to provide a display process which has high resolution but utilizes minimal memory. In so doing, memory is used for high-resolution areas only where needed. The multi-resolution structure is a very good approximation to the theoretical mapping table in the areas where it is needed. At the same time, since the high resolution areas are localized, a significant reduction in memory storage is possible.
An apparatus and method for allowing color adjustments in display devices is disclosed The apparatus comprises a multi-resolution structure for providing color adjustments; and an interpolator for interpolating at least one offset of the multi-resolution structure. An apparatus and method in accordance with the present invention uses a combination of color look-up tables with different levels of resolution, followed by interpolation to provide a display process which has high resolution but utilizes minimal memory. In so doing, memory is used for high-resolution areas only where needed. The multi-resolution structure is a very good approximation to the theoretical mapping table in the areas where it is needed. At the same time, since the high resolution areas are localized, a significant reduction in memory storage is possible.
