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The International Standard series ISO/IEC 15775
and DIS ISO/IEC 19839-1 to 4 for specifying
image reproduction properties of colour reproduction
processes analog-analog (copiers), analog-digital
(scanners) and digital-analog (printers, monitors)
seem to overlap with the International Standard
series IEC 61966-X for scanners, printers and
displays. But there are fundamental differences. In
the ISO/IEC standards the coding of colours is
based on reflective colours (defined for standard
offset printing) and in the IEC series on luminous
colours (defined for television).
Members of the standard groups ISO/IEC JTC1/
SC28 and IEC TC100 TA2 which developed the
above standards try at the moment to define
extended colour spaces (wide gamut colour spaces)
compatible with the present spaces of the standards
ISO/IEC 15775:1999-12 and IEC 61966-2-1:1999-
10.The extended spaces should match the
requirements of both the users and the industry for
the different applications. Important advantages and
disadvantages of both solutions based on coding of
reflective and luminous colours are presented.
Four ISO/IEC-test charts in different modes (halftone
and continuous tone, in reflectance and
transmittance mode) have been defined in ISO/IEC
15775 and ISO/IEC DIS 19839-1 to 4 to
specify image reproduction properties of colour
copiers, printers, scanners and monitors.
Corresponding test charts have been defined in DIN
33866-1 to 5.
All colours of all test charts are defined in CIELAB
coordinates. Main colour series are equally spaced
in CIELAB colour space both in lightness L* and
chroma C*. Up to now there are productions of DIN
and JBMA (Japan Business Machine Makers
Association) according to ISO/IEC 15775 which can
be used for all applications.