2,315 research outputs found
Computer mediated colour fidelity and communication
Developments in technology have meant that computercontrolled
imaging devices are becoming more powerful and more
affordable. Despite their increasing prevalence, computer-aided
design and desktop publishing software has failed to keep pace, leading
to disappointing colour reproduction across different devices.
Although there has been a recent drive to incorporate colour management
functionality into modern computer systems, in general this
is limited in scope and fails to properly consider the way in which
colours are perceived. Furthermore, differences in viewing conditions
or representation severely impede the communication of colour
between groups of users.
The approach proposed here is to provide WYSIWYG colour
across a range of imaging devices through a combination of existing
device characterisation and colour appearance modeling techniques.
In addition, to further facilitate colour communication, various common
colour notation systems are defined by a series of mathematical
mappings. This enables both the implementation of computer-based
colour atlases (which have a number of practical advantages over
physical specifiers) and also the interrelation of colour represented in
hitherto incompatible notations.
Together with the proposed solution, details are given of a computer
system which has been implemented. The system was used by
textile designers for a real task. Prior to undertaking this work,
designers were interviewed in order to ascertain where colour played
an important role in their work and where it was found to be a problem.
A summary of the findings of these interviews together with a
survey of existing approaches to the problems of colour fidelity and
communication in colour computer systems are also given. As background
to this work, the topics of colour science and colour imaging
are introduced
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AN APPRAISAL OF THE DEVELOPMENTS IN THE REPRODUCTION OF COLOUR IN COMPUTER PUBLISHING SYSTEMS
The plethora of coloured images that are reproduced in any printed media is facilitated through a variety of related processes that collectively constitute traditional printing techniques. The aim of this research is to appraise recent developments that have occurred within the colour prepress process. The colour prepress process involves the preparation of colour separated halftone films that are used in the production of offset lithographic printing plates. Over recent years the application of desktop publishing technology to perform many of the functions associated with the colour prepress process has raised a number of significant issues and debates.
The reproduction of coloured images in the printed medium demands that certain fundamental criteria are adhered to in order to maintain professional standards of colour fidelity. Such criteria include: successful digital halftone production, the elimination of moiré patterns, and maintaining colour fidelity between the coloured original and the coloured reproduction. This research thesis shall therefore establish the principles and techniques involved in the reproduction of colour in a printed medium. It will also asses whether desktop publishing systems are able to facilitate successful professional colour reproduction by examining current debates that challenge the viability of desktop publishing solutions. Current debates concerning desktop publishing solutions are primarily concerned with assessing the value of Adobe PostScript level 2 solutions, computer interchange spaces for colour matching purposes, and rational supercell techniques that attempt to eliminate moiré patterns. The research also attempts to establish the validity of current debate findings by comparing them with statistics derived hom a questionnaire (undertaken as part of the research program) that seeks the opinions of system users on the effectiveness of their individual systems at processing and delivering acceptable colour separations
What You See Isn\u27t Always What You Get: An Evaluation of Color Differences Across Different Devices
The objective of this thesis was to examine color differences between different digital devices such as, phones, tablets, and monitors. New technology has always been the catalyst for growth and change within the printing industry. With gadgets like the iPhone and the iPad becoming increasingly more popular in the recent years, printers have yet another technological advancement to consider. Soft proofing strategies use color management technology that allows the client to view their proof on a monitor as a duplication of how the finished product will appear on a printed piece of paper. A possible problem can occur if clients are not using a calibrated monitor to view proofs.. Today\u27s generation is obsessed with new technology and more importantly convenience. As the printing industry continues to evolve it is critical to consider the devices that clients are using to view proofs and the possible color differences that exist between those devices.
Within this thesis the following questions were the basis of the research:
* Do color differences exist between the phones, tablets, and monitors?
* If color differences are present, what is the Delta-E value compared to the standard?
* Do specific colors produce higher Delta-E values?
* Are certain brand devices more color accurate than others
A case study in digitizing a photographic collection
This paper reviews the processes involved in the digitisation, display and storage of medium size collections of photographs using mid-range commercially available equipment. Guidelines for evaluating the performance of these digitisation processes based on aspects of image quality are provided. A collection of photographic slides, representing first-generation analogue reproductions of a photographic collection from the nineteenth century, is treated as a case study. Constraints on the final image quality and the implications of digital archiving are discussed. Full descriptions of device characterisation and calibration procedures are given and results from objective measurements carried out to assess the digitisation system are presented. The important issues of file format, physical storage and data migration are also addressed
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