BS EN 61966-8-2001 pdf download.Multimedia systems and equipment Colour measurement and management
Part 8: Multimedia colour scanners.
This part 8 of IEC 61966 is applicable to the characterization and assessment of multimedia colour scanners used in computer systems, multimedia and similar applications.
The methods of measurement standardized in this part are designed to make possible the characterization and objective performance assessment of multimedia colour scanners which can capture colour images and output colour information such as red, green and blue data from reflective originals. The measured results are intended to be used for the purpose of colour management in multimedia systems. Measurement conditions, possible methods of measurement and characterization are defined to make colour management possible.
Colour control within the equipment is out of the scope of this part. For calibration of prepress input scanners, ISO 12641 will be applied.
2 Normative references
The following normative documents contain provisions which, through reference in this text. constitute provisions of this part of IEC 61966. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IEC 61966 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 60050(845)/CIE 17.4:1987, International Electrotechnical Vocabulary (1EV) — Chapter 845:
Lighting — International Lighting Vocabulary (IECICIE joint publication)
IEC 61966-2-1:1999. Multimedia systems and equipment — Colour measurement and management — Part 2-1: Colour management — Default RGB colour space — sRGB
CIE 15.2:1986, Colorimetry
ISO 5-4:1995, Photography — Density measurements — Part 4: Geometric conditions for reflection density
ISO 924 1-8:1997, Ergonomic requirements for office work with visual display terminals (VDTs)
— Part 8: Requirements for displayed colours
ISO 12641:1997, Graphic technology — Prepress digital data exchange — Colour targets for in put scanners calibration
ISO 13655:1996, Graphic technology — Spectral measurement and colorimetric computation for graphic arts images
ISO/CIE 10527:1991, CIE standard colorimetric observers
3 Terms and definitions
For the purpose of this part of IEC 61966, the definitions given in IEC 60050(845)/CIE 17,4 and the following apply.
illuminant E
illuminant of constant spectral power distribution S 1 where S,, represents the relative radiant power in the ,i-th interval per 10 nm bandwidth
3.2
input scanner
equipment capable of converting the light reflected by a photographic paper into electronic signals, where the electronic signals are arranged to have an organized relationship to the spatial areas of the paper evaluated
3.3
multimedia colour scanner
electrotechriical equipment with a light source illuminating a scanning area where an original is placed, which provides means to sense colour signals from the light reflected from specified picture elements within the scanning area in digital form as Output data
3.4
driver software
computational function to control the multimedia colour scanner from internal parameters and parameters specified by the user such as scaling of scan, spatial resolution, etc. comprising a colour control function to convert the colour signals of the multimedia colour scanner into approximate components of a defined colour space such as the sRGB colour space in lEG 61966-2-1 or an equipment independent colour space such as the CIE 1931 XYZ colour space or the CIELAB colour space in CIE 15.2
3.5
light flux
incident radiant power valued by physical spectral responsivities
3.6
scanning area
dimension of the area to be scanned, given in square centimetres or the number of resolved picture elements along the vertical and the horizontal directions from which digital image data are made readily available at the output
The scaling of scan shall be set to unity. Resolution of scanning shall be set to the maximum spatial resolution. The multimedia colour scanner shall be powered on 1 h before the measurement, except for the measurement In clause 12.
Environmental conditions such as temperature and relative humidity shall be reported together with the results of measurement. If additional environmental conditions are described in the manufacturer’s specifications, these should be taken into account.
Unless otherwise stated in this standard, conditions of measurement shall be set to the conditions recommended by the manufacturer as default conditions.
5.2 Output digital image data
Red — green — blue digital image data, DR. D0, D8, corresponding to the target shall be used as basic data for reporting and further processing of the data. If direct output from the multimedia colour scanner is not available, red — green — blue data shall be calculated using the driver software provided or specified by the manufacturer of the equipment being characterized.
When a general-purpose software is used for handling the raw data, its name and version number shall be reported together with the results of measurements.
6 Measurement equipment and target of scan
6.1 Spectrophotometer
A spectrophotometer with the following specifications shall be used for the measurements.
a) Wavelength range and interval: minimum range between 400 nm and 700 nm at 10 nm intervals, measurements beyond the minimum range are
permissible.
b) Geometry: 450/00 or 00/450 per ISO 5-4.
The guidance in ISO 13655 shall be taken into account as appropriate.
6.2 Spectroradlometer
A one-shot spectroradiometer, which picks up spectral data in parallel at a certain time, with the following specifications shall be used for the measurement of spectral distribution of the built-in light source in clause 7.
a) Wavelength range and interval: minimum range between 400 nm and 700 nm at 10 nm intervals, measurements beyond the minimum range are permissible.BS EN 61966-8-2001 pdf download.