Details:
Summary:
The development of open systems, particularly in the area of desktop publishing has resurrected the desire to use CIE colour definitions (or some single derivative of them) as a basis for the data processing and storage in electronic imaging systems. This is often called Device Independent Colour. As discussed in earlier TAGA presentations (Johnson 1989 and 1990) this has significant advantages for open systems but potential disadvantages for image quality. The major issues for quality relate to gamut compression, black (or other special colour), definitions data precision, and the use of colour difference spaces to define appearance. Crosfield have been active in investigating these issues in recent years and in 1990 we reviewed our activities in colour appearance modeling. As discussed in earlier TAGA presentations (Johnson 1989 and 1990) this has significant advantages for open systems but potential disadvantages for image quality. The major issues for quality relate to gamut compression, black (or other special colour), definitions data precision, and the use of colour difference spaces to define appearance. Crosfield have been active in investigating these issues in recent years and in 1990 we reviewed our activities in colour appearance modeling. This work is still on-going and has now been extended to include the appearance of photographic transparencies. The resultant model (based on the Fluut 1991 model) will be described. We have also been working in a collaboration project with other European partners to transmit images in 24 bit CIELab form. This has necessitated Crosfield demonstrating Device Independent Systems. The experience of this exercise will be discussed and some of the problems encountered and solutions found.