BS ISO/IEC 17823:2015 pdf download-Colour terminology for office colour equipment.
1 Scope This International Standard provides definitions for colour terms used with office equipment, in particular for use with colour scanning and printing devices that have digital imaging capabilities, including multi-function devices. This International Standard is not intended to replace terms and definitions published in documents or user interfaces issued or created by manufacturers. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 colour balance adjustment of colour channel gains or processing 2.1.1 grey balance set of tone values for cyan, magenta and yellow that are expected to appear as an achromatic grey under specified viewing conditions when printed using the specified printing conditions Note 1 to entry: The user can choose between the following two practical definitions and one theoretical definition of grey, depending upon the particular context. a) practical definitions: 1) a colour having the same CIELAB a* and b* values as the print substrate; 2) a colour that has the same CIELAB a* and b* values as a half-tone tint of similar L* value printed with black ink; b) theoretical definition: 1) the colourimetric definition of grey is when the CIELAB a* and b* values are both equal to 0. [SOURCE: ISO/TS 10128:2009, 3.3, modified] 2.2 black 2.2.1 composite black printing black with multiple colourants 2.2.2 pure black black generated only in black colourant in a printing device 2.2.3 rich black black generated by a mixture of black colourant and other colourants in a printing device
2.3 calibration set of operations that establish, under specified conditions, the relationship between values of quantities indicated by a measuring instrument or measuring system, or values represented by a material measure or a reference material, and the corresponding values realized by standards [SOURCE: ISO 14807:2001, 3.11] 2.4 colour appearance aspect of visual perception by which things are recognized by their colour [SOURCE: CIE S17/E:2011 ILV, 17-199, modified — “2.” part has been removed.] 2.4.1 brightness attribute of a visual perception according to which an area appears to emit, or reflect, more or less light [SOURCE: CIE S17/E:2011 ILV, 17-111] 2.4.2 colourfulness attribute of a visual sensation according to which the perceived colour of an area appears to be more or less chromatic [SOURCE: ISO/IEC 8613-2:1995] 2.4.3 highlight colour especially light and low chroma colour 2.4.4 metamerism phenomenon characterized by the difference in colour observed when two specimens visually matching under a given light source are viewed under another light source with different spectral characteristics [SOURCE: ISO 4618:2014, 2.157]