Abstract: The invention is a process for producing an optimised printing form comprising printing onto a substrate with a printing form with predetermined raster percentages on the printing press to obtain a test print in form of a stepped wedge with raster patches, measuring the reflectance spectrum of each raster patch, determining associated colorimetric values L*,a*,b* from the reflectance spectrum, transforming the colorimetric values L*,a*,b* for each raster patch in linear correlation with the color perception of the human eye, using the formula RCD = ( L * ? rasterpatch - L * ? substrate ) 2 + ( a * ? rasterpatch - a * ? substrate ) 2 + ( b * ? rasterpatch - b * ? substrate ) 2 ( L * ? solidshade - L * ? substrate ) 2 + ( a * ? solidshade - a * ? substrate ) 2 + ( b * ? solidshade - b * ? substrate ) 2 · 100 ? [ % ] wherein RCD is the relative colorimetric difference expresse

Abstract: A system and method of controlling printing are disclosed. The system and method comprise inputting image data printed by a printing section and a preset value for a print medium's size corresponding to the image data; measuring a size of each print medium being fed to the printing section; comparing the measured value for the each measured print medium and the preset value for the print medium's size; counting the number of times in which difference is occurred between the measured value and the preset value; and determining whether the print mediums fed to the printing section are different from the preset print medium's size by comparing the counted number of times and a predetermined reference number of times.

Abstract: Offline proofing systems and methods for color image processing may include receiving a digitized image document to be press printed in a job, determining job status as corresponding to one of a color managed proof and a color managed press, installing a proofer profile as an output profile and a press profile as a simulation profile in response to the job status corresponding to the color managed proof, printing the job by the proof printer as a proof copy in response to the color managed proof, installing the press profile as an output profile and discarding the simulation profile in response to the job status corresponding to the color managed press, and printing the job by the press printer as a press copy in response to the color managed press. The color managed press may be based on a customer contract approval. The proofer profile may correspond to a proof printer and the press profile may correspond to a press printer.

Abstract: An image reading apparatus includes, with the purpose of detecting noise in an image due to dust on a platen, three line sensors, a platen between an original and the line sensors, a moving mechanism for moving the platen, a noise detection processor detecting noise pixels from multiple data output from the line sensors, an order determination unit determining the order in which the noise pixel is detected, based on the order in which the line sensors are arranged and the direction in which the platen is moved, and a noise length calculator predicting the noise length in the sub scanning direction based on the number of noise pixels successive in the main scanning direction, the original transport rate, the platen moving rate, and the distance between the line sensors.

Abstract: An image processing system receives an input gradient number m, input image data I(x,y) whose input gradient number is m, and an output gradient number n and calculates output image data O(x,y) having an output gradient number of n on the basis of the following formula (1). O(x,y)=int[?+d(xd,yd)/(gmax+1)] ??(1) When ? is an integer, the output image data O(x,y) is calculated on the basis of a formula obtained by substituting the calculated ?? for ? in the above formula (1), whereas when ? is not an integer, the output image data O(x,y) is calculated on the basis of the above formula (1).