Test targets 5.0: A Collaborative effort exploring the use of scientific methods for color imaging and process control

Test Targets is about scholarship that intimately involves faculty and students in the process of writing and publishing. It is a collection if research papers that require collaborative effort over a time span of three academic quarters. Initially, students learned metrology, color management system, and the use of test targets for device optimization and process control. As time goes by, students are encouraged to identify research topics, formulate methodologies, and carry out experiments and data analyses in order to have specific findings. - p.

Optimizing Separation Parameters for Dedicated CMYKIR Reproduction Purposes With Hidden Double Information

Contemporary programming support for image correction and manipulation for graphic arts purposes implies partially regardless RGB/CMYK separation options, where particular parameters can be adjusted separately or by means of ICC profiles. As input image information can be reached from different dynamic range devices or can be generated, output reproduction devices can use various substrates and media, so additional adjustments and researches have to be carried out. CMYKIR reproduction has specific demands, while through the visual part of the spectrum (VS) colour management controls response and experience outside the visual, i.e. hidden information in the near infrared (NIR) domain, and claims to find dedicated adjustments for specificities of VS-CMYKIR reproduction

The development of methodologies for color printing in digital inkjet textile printing and the application of color knowledge in the Ways of Making Project

Digital textile printing (DTP) offers creative potential and entrepreneurial business models in textile design. Designers are no longer restricted to a number of colors or pattern repeat. It has become possible to print fabric without large set-up costs. This relatively sustainable technology reduces water-usage and dye-wastage. DTP meets Just in Time, Concept to Consumer demand, reducing stock wastage. However, there is a marked difference between screen-color to print-color and software allows a user to select colors unprintable using CMYK (cyan, magenta, yellow, black) colorants. Color results are further affected by factors such as structure and composition of the fabric, dye type, printer communications, fabric pre-treatments and secondary processes. A textile designer will be required to understand and experiment with a number of variables in order to feel color-confident. This paper presents investigations which focused on developing methods to aid a designer’s color expectation knowledge, using a Practice-as-Research methodology. Outcomes include a color reference book, digital lap dip tests presented as color maps, and a set of indicator ICC profiles, generated from data accumulated through measuring printed color differences on a variety of substrates. These visual prompts are intended to support designers to build their own internal color look-up table enabling them to predict and resolve color issues during the design process.Finally, the paper concludes by presenting a Case Study detailing an application of these color methods by the researcher for the Ways of Making project, a collaboration between Sir Peter Blake, Worton Hall Studios and Centre for Fine Print Research (CFPR) at University of West of England (UWE). Here, the indicator profiles were applied to Blake’s images, altering the color data to create experimental color modifications and printed onto silk. An initial selection of works from the project were exhibited at London Original Print Fair, Royal Academy, April 2019

Test Targets 8.0: A Collaborative effort exploring the use of scientific methods for color imaging and process control

Publishing is both a journey and a destination. In the case of Test Targets, the act of creating and editing content, paginating and managing digital assets, represents the journey. The hard copy is the result or destination that readers can see and touch. Like the space exploration program, everyone saw the spacecraft that landed on the moon. It was the rocket booster that made the journey from the earth to the moon possible. This article portrays the process of capturing ideas in the form of digital data. It also describes the process of managing digital assets that produces the Test Targets publication

BCR’s CDP Digital Imaging Best Practices, Version 2.0

This is the published version.These Best Practices — also referred to as the CDP Best Practices -- have been created through the collaboration of working groups pulled from library, museum and archive practitioners. Version 1 was created through funding from the Institute for Museum and Library Services through a grant to the University of Denver and the Colorado Digitization Program in 2003. Version 2 of the guidelines were published by BCR in 2008 and represents a significant update of practices under the leadership of their CDP Digital Imaging Best Practices Working Group. The intent has been to help standardize and share protocols governing the implementation of digital projects. The result of these collaborations is a set of best practice documents that cover issues such as digital imaging, Dublin Core metadata and digital audio. These best practice documents are intended to help with the design and implementation of digitization projects. Because they were collaboratively designed by experts in the field, you can be certain they include the best possible information, in addition to having been field tested and proven in practice. These best practice documents are an ongoing collaborative project, and LYRASIS will add information and new documents as they are developed

Scanning ratios for desktop imaging

Users of desktop scanning technology are conscious about the quality the image detail reproduction. Repeatability and accuracy are based on certain standards. Established scanning procedures for charged couple device (CCD) desktop scan ners are primarily influenced by the Nyquist Criterion which states that an image must be sampled at twice the frequency of the line screen ruling that will be used to print the final image. These rules of thumb appear in many techni cal and trade publications that are consulted by the printing industry in order to insure the quality of printed products. Quality is not the only factor influenced by scanning ratios. File size, processing time, and cost are also affected. The purpose of this study was to discover if it is possible to reduce sampling ratios below 2:1 while still preserving the desired level of image detail. The paired comparisons method of testing was employed to determine the threshold where a population could no longer discern the difference between images scanned at a 2:1 scanning ratio and images scanned at lower frequencies. The tests involved a high and low detail image scanned at ratios between 1:1 and 2:1. These were out put by an image-setter to films at 85 lpi and 133 lpi. The results of the statistical analysis show that it is possible to reduce the scanning frequency below the limit established by the Nyquist Criterion while still maintaining a consistent level of perceived detail in an image. Also, it was shown that as the level of detail in an image decreases and as the line screen frequency used increases the scanning ratio can be allowed to decrease. Therefore, it is possible to reduce the size of a file before it is created and consequentially to reduce the time required to per form image processing functions

N-colour separation methods for accurate reproduction of spot colours

In packaging, spot colours are used to print key information like brand logos and elements for which the colour accuracy is critical. The present study investigates methods to aid the accurate reproduction of these spot colours with the n-colour printing process. Typical n-colour printing systems consist of supplementary inks in addition to the usual CMYK inks. Adding these inks to the traditional CMYK set increases the attainable colour gamut, but the added complexity creates several challenges in generating suitable colour separations for rendering colour images. In this project, the n-colour separation is achieved by the use of additional sectors for intermediate inks. Each sector contains four inks with the achromatic ink (black) common to all sectors. This allows the extension of the principles of the CMYK printing process to these additional sectors. The methods developed in this study can be generalised to any number of inks. The project explores various aspects of the n-colour printing process including the forward characterisation methods, gamut prediction of the n-colour process and the inverse characterisation to calculate the n-colour separation for target spot colours. The scope of the study covers different printing technologies including lithographic offset, flexographic, thermal sublimation and inkjet printing. A new method is proposed to characterise the printing devices. This method, the spot colour overprint (SCOP) model, was evaluated for the n-colour printing process with different printing technologies. In addition, a set of real-world spot colours were converted to n-colour separations and printed with the 7-colour printing process to evaluate against the original spot colours. The results show that the proposed methods can be effectively used to replace the spot coloured inks with the n-colour printing process. This can save significant material, time and costs in the packaging industry

BLIZANCI BOJILA ZA PROŠIRENJE INFRA INFORMACIJSKE TEHNOLIGIJE

Druga, proširena slika pripremljena za NIR područje sastavni je dio slike u vidljivom dijelu spektra. Za njene potrebe slika za vizualno područje priređena je i definirana pravilima upravljanja bojama za vizualno područje, dok se druga slika za NIR područje bazira na akromatskoj redukciji osnovnih CMY pokrivenosti uz karbon crnu i instrumentalni prikaz. Budući da je upravljanje bojama u osnovi povezano s vidljivim dijelom, standardno akromatsko podešavanje nije prilagođeno za NIR potrebe, namjenski prilagođeni workflow je prikazan za potrebe druge slike