جستجوی مقالات مرتبط با کلیدواژه "مدیریت رنگ" در نشریات گروه "مهندسی شیمی، نفت و پلیمر"

A condition that must be satisfied for digital printers in a color management system is converting device-dependent color values into device-independent color values by a transfer model of high-quality performance. Usually, each transfer model is initially trained with some specified samples as a training set before being tested. In the present study, color charts with different quantities of color patches in an RGB space were selected and printed as training groups.  The spectral reflectances of all samples in printed color charts were measured and converted to an XYZ color space under a standard observer/illuminant combination. Using a matrix method, the RGB to XYZ transformation matrices were obtained with the algebraic operation of different degrees of polynomials and the least-square errors for the training groups.Similar operations were also performed for the well-known ProfileMaker software, which is based on a look-up table method. Finally, the statistical values of color difference (DE2000) were calculated between the actual XYZ from the printed color charts, the predicted XYZ from the matrix method, and those predicted from the ProfileMaker software. The ProfileMaker software showed a significantly lower color difference near the perception threshold for the specified training samples.

The most important challenges in color technology with that researchers and industries are faced, is description, consistency and control of color appearance while is supposed to be transferred between different reproduction devices. In this article, the concept of color management for color reproduction of digital images as a suggested solution has been reviewed in brief to achieve a color consistency of an image during workflow from the design step to the publishing step. Color management system makes it possible to keep the color appearance of image consistent between different devices. This is possible if dependent-device color values could be converted to independent-device ones through an intermediate color space. Moreover, the image color management workflow, the conventional methods and the related standards with that have been pointed, too.

The use of different papers in inkjet printers is a normal practice. However, due to the variety of the texture and gloss of such papers as well as the extent to which various papers enable the penetration of the ink into these papers would result in various results in the printed colors. In other words, such various in the papers affect the prediction accuracy of any model used for making the profiles in the color management process.In present article the effect of four paper types on the final printed papers as predicted by a cube nearest neighbor, prediction model in LUT profiles in an inkjet printer was investigated. The deciding parameters were repeatability and color gamut volume. The results show that this prediction model gave the best printed colors on the utilized matte paper.