1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU T.43 Amendment 1 (02/2000) SERIES T: TERMINALS FOR TELEMATIC SERVICES Colour and gray-scale image representations using lossless coding scheme for facsimile Amendment 1: Accommodation of new and future Resolu
2、tions ITU-T Recommendation T.43 - Amendment 1 (Previously CCITT Recommendation) ITU-T T-SERIES RECOMMENDATIONS TERMINALS FOR TELEMATIC SERVICES For further details, please rer to ITD-T List of Recommendations. ITU-T RECOMMENDATION T.43 COLOUR AND GRAY-SCALE IMAGE REPRESENTATIONS USING LOSSLESS CODIN
3、G SCHEME FOR FACSIMILE AMENDMENT 1 Accommodation of new and future resolutions Summary In April 1999, ITU-T adopted new higher resolutions of 300 x 600, 400 x 800, 600 x 600, 600 x 1200 and 1200 x 1200 peld25.4 mm while 100 x 100 peld25.4 mm was introduced a year earlier. This amendment assists the
4、comprehension of the appropriate square resolution subset of these new resolutions: it is also written in a manner that accommodates future T.30 resolution enhancements without requiring corresponding amendments. Source Amendment 1 to ITU-T Recommendation T.43 was prepared by ITU-T Study Group 8 (19
5、97-2000) and was approved under the WTSC Resolution No. 1 procedure on 10 February 2000. Recommendation T.43/Amd.1(02/2000) 1 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Telecommunication Standardization
6、Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), whi
7、ch meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of informatio
8、n technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. I
9、NTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Propert
10、y Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, i
11、mplementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 2000 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including
12、 photocopying and microfilm, without permission in writing fiom the ITU. CONTENTS Page 1 Subclause 7.2.2.2 . 11 Recommendation T.43/Amd.l (02/2000) Recommendation T.43 COLOUR AND GRAY-SCALE IMAGE REPRESENTATIONS USING LOSSLESS CODING SCHEME FOR FACSIMILE AMENDMENT 1 Accommodation of new and future r
13、esolutions (Geneva, 2000) Subclause 7.2.2.2 In this subclause the “Spatial resolution“ parameter is generalized so that it does not have to be changed with each change in resolution. To do this: ChangeJFom: Spatial resolution: (2 octets) Pixel density in peld25.4 mm. The basic value is 200. Allowed
14、values are 200, To: Spatial resolution: (2 octets) Pixel density in peld25.4 mm. The basic value is 200. Any square resolution value (i.e. same number of vertical and horizontal pels), as defied in Table 2/T.30, may be used (e.g. 200, 300,400, etc.). 300 and 400. Recommendation T.43/Amd.1(02/2000) 1
15、 Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Series M Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Y Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means o
16、f expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operation and human factors Non-telephone telecommunication services Transmission systems and media, digital systems and networks Au
17、diovisual and multimedia systems Integrated services digital network Transmission of television, sound programme and other multimedia signals Protection against interference Construction, installation and protection of cables and other elements of outside plant TMN and network maintenance: internati
18、onal transmission systems, telephone telegraphy, facsimile and leased circuits Maintenance: international sound programme and television transmission circuits Specifications of measuring equipment Telephone transmission quality, telephone installations, local line networks Switching and signalling T
19、elegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communications Global information infrastructure and Internet protocol aspects Languages and general software aspects for telecommunication systems circuits,
