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1、DRAFT FOR DEVELOPMENT DD ISO/TS 22028-2:2006 Photography and graphic technology Extended colour encodings for digital image storage, manipulation and interchange Part 2: Reference output medium metric RGB colour image encoding (ROMM RGB) ICS 37.040.99; 37.100.01 ? Licensed Copy: London South Bank Un
2、iversity, London South Bank University, Tue Dec 12 05:16:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI DD ISO/TS 22028-2:2006 This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 29 September 2006 BSI 2006 ISBN 0 580 49207 9 National foreword
3、 This Draft for Development was published by BSI. It is the UK implementation of ISO/TS 22028-2:2006. This publication is not to be regarded as a British Standard. It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this prov
4、isional basis, so that information and experience of its practical application can be obtained. Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the international organization responsible for its conversion to an international standar
5、d. A review of this publication will be initiated not later than 3 years after its publication by the international organization so that a decision can be taken on its status. Notification of the start of the review period will be made in an announcement in the appropriate issue of Update Standards.
6、 According to the replies received by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into an international Standard, to extend the life of the Technical Specification or to withdraw it. Comments should be sent to the Secretary of the respons
7、ible BSI Technical Committee at British Standards House, 389 Chiswick High Road, London W4 4AL. The UK participation in its preparation was entrusted to Technical Committee CPW/42, Photography. A list of organizations represented on CPW/42 can be obtained on request to its secretary. This publicatio
8、n does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:16:13 GMT+00:00 2006, Uncont
9、rolled Copy, (c) BSI Reference number ISO/TS 22028-2:2006(E) TECHNICAL SPECIFICATION ISO/TS 22028-2 First edition 2006-08-15 Photography and graphic technology Extended colour encodings for digital image storage, manipulation and interchange Part 2: Reference output medium metric RGB colour image en
10、coding (ROMM RGB) Photographie et technologie graphique Codages par couleurs tendues pour stockage, manipulation et change dimage numrique Partie 2: Codage dimage en couleurs RVB par rfrence de sortie par voie mtrique DD ISO/TS 22028-2:2006 Licensed Copy: London South Bank University, London South B
11、ank University, Tue Dec 12 05:16:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:16:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references.
12、 1 3 Terms and definitions. 1 4 Requirements 5 4.1 General. 5 4.2 Reference viewing environment 5 4.3 Reference medium 6 4.4 ROMM RGB colour image encoding. 7 4.5 Inverse ROMM RGB transformation . 9 Annex A (informative) Selection of ROMM RGB colour encoding 11 Annex B (informative) Conversion betwe
13、en ROMM RGB and video RGB 15 Bibliography. 17 DD ISO/TS 22028-2:2006 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:16:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv Foreword ISO (the International Organization for Standardization) is a worldwide federatio
14、n of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee.
15、 International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance wi
16、th the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires appro
17、val by at least 75 % of the member bodies casting a vote. In other circumstances, particularly when there is an urgent market requirement for such documents, a technical committee may decide to publish other types of normative document: an ISO Publicly Available Specification (ISO/PAS) represents an
18、 agreement between technical experts in an ISO working group and is accepted for publication if it is approved by more than 50 % of the members of the parent committee casting a vote; an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical committee and is
19、accepted for publication if it is approved by 2/3 of the members of the committee casting a vote. An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or
20、 ISO/TS is confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an International Standard or be withdrawn. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be h
21、eld responsible for identifying any or all such patent rights. ISO/TS 22028-2 was prepared by Technical Committee ISO/TC 42, Photography, in collaboration with Technical Committee ISO/TC 130, Graphic technology. ISO/TS 22028 consists of the following parts, under the general title Photography and gr
22、aphic technology Extended colour encodings for digital image storage, manipulation and interchange: Part 1: Architecture and requirements Part 2: Reference output medium metric RGB colour image encoding (ROMM RGB) Technical Specification Part 3: Reference input medium metric RGB colour image encodin
23、g (RIMM RGB) Technical Specification DD ISO/TS 22028-2:2006 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:16:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Introduction This part of ISO 22028 has been developed in order to meet the industry need for a comp
24、lete, fully-documented, publicly-available definition of a wide-primary output-referred extended gamut red-green-blue (RGB) colour image encoding. This colour image encoding provides a way to represent output- referred images that does not limit the colour gamut to those colours capable of being dis
25、played on a CRT monitor, such as that represented by the standard RGB (sRGB) colour encoding, or require the use of negative RGB colorimetry co-ordinates, such as with extended sRGB colour encodings like bg-sRGB. An extended colour-gamut colour encoding is particularly desirable for professional pho
26、tography applications. For example, colours used for company logos can be outside a monitor gamut and would therefore need to be clipped or compressed to a less saturated colour. Similarly, scanned photographic prints that are to be duplicated can contain colours outside a monitor RGB colour gamut.
27、By using a standard output-referred extended gamut colour image encoding, images containing such colours can be stored, interchanged, manipulated, and later printed, without limiting or distorting the colours of the final output. The Reference output medium metric RGB (ROMM RGB) colour image encodin
28、g specified in this part of ISO 22028 meets the needs of these types of applications. This part of ISO 22028 is prepared as a Technical Specification to provide sufficient documentation, consistent with the definitions of ISO 22028-1, to allow the imaging community adequate opportunity for implement
29、ation and evaluation of this colour image encoding. It is anticipated that, when there is sufficient implementation of and practical experience in the use of ROMM RGB, this Technical Specification can be revised as an International Standard. DD ISO/TS 22028-2:2006 Licensed Copy: London South Bank Un
30、iversity, London South Bank University, Tue Dec 12 05:16:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:16:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Photography and graphic technology Extended colour
31、encodings for digital image storage, manipulation and interchange Part 2: Reference output medium metric RGB colour image encoding (ROMM RGB) 1 Scope This Technical Specification defines a family of extended colour-gamut output-referred RGB colour image encodings designated as Reference output mediu
32、m metric RGB (ROMM RGB). Digital images encoded using ROMM RGB can be manipulated, stored, transmitted, displayed, or printed by digital still picture imaging systems. Three precision levels are defined using 8-, 12- and 16-bits/channel. 2 Normative references The following referenced documents are
33、indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 15076-1:2005, Image technology colour management Architecture, profile format and da
34、ta structure Part 1: Based on ICC.1:2004-10 ISO 22028-1:2004, Photography and graphic technology Extended colour encodings for digital image storage, manipulation and interchange Part 1: Architecture and requirements ISO/CIE 10527:1991, CIE standard colorimetric observers CIE Publication 15, Colorim
35、etery 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 adapted white colour stimulus that an observer who is adapted to the viewing environment would judge to be perfectly achromatic and to have a luminance factor of unity; i.e. absolute color
36、imetric coordinates that an observer would consider to be a perfect white diffuser NOTE The adapted white can vary within a scene. 3.2 additive RGB colour space colorimetric colour space having three colour primaries (generally red, green and blue) such that CIE XYZ tristimulus values can be determi
37、ned from the RGB colour space values by forming a weighted combination of DD ISO/TS 22028-2:2006 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:16:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 the CIE XYZ tristimulus values for the individual colour primar
38、ies, where the weights are proportional to the radiometrically linear colour space values for the corresponding colour primaries NOTE 1 A simple linear 3 3 matrix transformation can be used to transform between CIE XYZ tristimulus values and the radiometrically linear colour space values for an addi
39、tive RGB colour space. NOTE 2 Additive RGB colour spaces are defined by specifying the CIE chromaticity values for a set of additive RGB primaries and a colour space white point, together with a colour component transfer function. 3.3 colorimetric colour space colour space having an exact and simple
40、 relationship to CIE colorimetric values NOTE Colorimetric colour spaces include those defined by CIE (e.g. CIE XYZ, CIELAB, CIELUV), as well as colour spaces that are simple transformations of those colour spaces (e.g. additive RGB colour spaces). 3.4 colour component transfer function single varia
41、ble, monotonic mathematical function applied individually to one or more colour channels of a colour space NOTE 1 Colour component transfer functions are frequently used to account for the nonlinear response of a reference device and/or to improve the visual uniformity of a colour space. NOTE 2 Gene
42、rally, colour component transfer functions will be nonlinear functions such as a power-law (i.e. “gamma”) function or a logarithmic function. However, in some cases a linear colour component transfer function can be used. 3.5 colour encoding generic term for a quantized digital encoding of a colour
43、space, encompassing both colour space encodings and colour image encodings 3.6 colour gamut solid in a colour space, consisting of all those colours that are either: present in a specific scene, artwork, photograph, photomechanical, or other reproduction; or capable of being created using a particul
44、ar output device and/or medium 3.7 colour image encoding digital encoding of the colour values for a digital image, including the specification of a colour space encoding, together with any information necessary to properly interpret the colour values such as the image state, the intended image view
45、ing environment and the reference medium NOTE 1 In some cases, the intended image viewing environment will be explicitly defined for the colour image encoding. In other cases, the intended image viewing environment can be specified on an image-by-image basis using metadata associated with the digita
46、l image. NOTE 2 Some colour image encodings will indicate particular reference medium characteristics, such as a reflection print with a specified density range. In other cases, the reference medium will be not applicable, such as with a scene- referred colour image encoding, or will be specified us
47、ing image metadata. NOTE 3 Colour image encodings are not limited to pictorial digital images that originate from an original scene, but are also applicable to digital images with content such as text, line art, vector graphics and other forms of original artwork. DD ISO/TS 22028-2:2006 Licensed Cop
48、y: London South Bank University, London South Bank University, Tue Dec 12 05:16:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 3.8 colour rendering mapping of image data representing the colour space coordinates of the elements of a scene to output- referred image data representing the colour space
49、 coordinates of the elements of a reproduction NOTE Colour rendering generally consists of one or more of the following: compensating for differences in the input and output viewing conditions; tone scale and gamut mapping to map the scene colours onto the dynamic range and colour gamut of the reproduction; applying preference adjustments. 3.9 colour space geometric representation of colours in space, usually of three dimensions CIE Publication 17.4:1987, 845-03-25