The following normative documents contain provisions which, -through reference in this text, constitute provisions of this -International Standard. For dated references, subsequent -amendments to, or revisions of, any of these publications do not -apply. However, parties to agreements based on this International -Standard 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 ISO and -IEC maintain registers of currently valid International -Standards.
- - -ISO 639:1988, -Code for the representation of names of languages.
- - -ISO/IEC 646:1991, -International Organization for Standardization, Information -technology — ISO 7-bit coded character set for information -interchange.
- - -ISO/IEC 3309:1993, -Information Technology — Telecommunications and -information exchange between systems — High-level data link -control (HDLC) procedures — Frame structure.
- - -ISO/IEC
-8859-1:1998, Information technology — 8-bit
-single-byte coded graphic character sets — Part 1: Latin
-alphabet No. 1.
- For convenience, here is a non-normative sample text file
- describing the codes and associated character names.
ISO/IEC -9899:1990(R1997), Programming languages — C.
- - -ISO/IEC -10646-1:1993/AMD.2, Information technology — -Universal Multiple-Octet Coded Character Sets (UCS) — Part -1: Architecture and Basic Multilingual Plane.
- - -IEC
-61966-2-1, Multimedia systems and equipment — Colour
-measurement and management — Part 2-1: Default RGB colour
-space — sRGB, available at http://www.iec.ch/.
ICC-1, International
-Color Consortium, "Specification ICC.1:2010-12 (Profile version 4.3.0.0)
-Image technology colour management - Architecture, profile format, and data structure,
-available at http://www.color.org/icc_specs2.xalter
-also published as ISO 15076-1
ICC-2,
-International Color Consortium, "Specification ICC.2:2019 (iccMAX)
-Image technology colour management - Extensions to architecture, profile format, and data structure,
-available at http://www.color.org/icc_specs2.xalter
-also published as ISO 20677-1
RFC-1123, Braden,
-R., Editor, "Requirements for Internet Hosts — Application
-and Support", STD 3, RFC 1123, USC/Information Sciences
-Institute, October 1989.
- http://www.ietf.org/rfc/rfc1123.txt
-
RFC-1950, Deutsch,
-P. and Gailly, J-L., "ZLIB Compressed Data Format Specification
-version 3.3", RFC 1950, Aladdin Enterprises, May 1996.
- http://www.ietf.org/rfc/rfc1950.txt
RFC-1951, Deutsch,
-P., "DEFLATE Compressed Data Format Specification version 1.3",
-RFC 1951, Aladdin Enterprises, May 1996.
- http://www.ietf.org/rfc/rfc1951.txt
RFC-2045, Freed,
-N. and Borenstein, N. , "MIME (Multipurpose Internet Mail
-Extensions) Part One: Format of Internet Message Bodies", RFC
-2045, Innosoft, First Virtual, November 1996.
- http://www.ietf.org/rfc/rfc2045.txt
RFC-2048, Freed,
-N., Klensin, J. and Postel, J., "Multipurpose Internet Mail
-Extensions (MIME) Part Four: Registration Procedures", RFC 2048,
-Innosoft, MCI, ISI, November 1996.
- http://www.ietf.org/rfc/rfc2048.txt
RFC-3066,
-Alvestrand, H., "Tags for the Identification of Languages", RFC
-3066, Cisco Systems, January 2001. (Obsoletes RFC 1766.)
- http://www.ietf.org/rfc/rfc3066.txt
ITU-T H.273,
-SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS
-Infrastructure of audiovisual services – Coding of moving video
-Coding-independent code points for video signal type identification
- https://www.itu.int/rec/T-REC-H.273
ITU-R BT.2100,
-SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS
-Infrastructure of audiovisual services – Coding of moving video
-Coding-independent code points for video signal type identification
- https://www.itu.int/rec/R-REC-BT.2100
ITU-R BT.709,
-SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS
-Infrastructure of audiovisual services – Coding of moving video
-Coding-independent code points for video signal type identification
- https://www.itu.int/rec/R-REC-BT.709
There are 19 chunk types defined in this International Standard. Chunk types are four-byte sequences chosen so that they - correspond to readable labels when interpreted in the ISO 646.IRV:1991 + correspond to readable labels when interpreted in the ISO 646.IRV:1991 [[ISO646]] character set. The first four are termed critical chunks, which shall be understood and correctly interpreted according to the provisions of this specification. These are:
@@ -2129,7 +2006,7 @@Chunk types are chosen to be meaningful names when the bytes -of the chunk type are interpreted as ISO 646 letters. Chunk types +of the chunk type are interpreted as ISO 646 letters [[ISO646]]. Chunk types are assigned so that a decoder can determine some properties of a chunk even when the type is not recognized. These rules allow safe, flexible extension of the PNG format, by allowing a PNG @@ -2379,7 +2256,7 @@
Filter method 0 specifies exactly this set of five filter types and this shall not be extended. @@ -4422,7 +4299,7 @@
Here is an example of source content that uses the BT.2100 colour primaries, +
Here is an example of source content that uses the BT.2100 colour primaries [[ITU-R BT.2100]], with the PQ transfer function, Matrix Coefficients (using RGB Identity)and Full-Range signal scaling
@@ -4436,7 +4313,7 @@-cICP 9 18 0 1
Here is an example of source content that uses BT.709 colour primaries, +
Here is an example of source content that uses BT.709 colour primaries [[ITU-R BT.709]], with the BT.709 transfer function, Matrix Coefficients (using RGB Identity)and Full-Range signal scaling
@@ -4817,13 +4694,13 @@iTXt set the compression method to 0, and decoders shall ignore it. -
The language tag defined in [[rfc3066]] +
The language tag defined in [[BCP47]] indicates the human language used by the translated keyword and the text. Unlike the keyword, the language tag is -case-insensitive. It is an ISO 646.IRV:1991 [[ISO 646]] string consisting of +case-insensitive. It is an ISO 646.IRV:1991 [[ISO646]] string consisting of hyphen-separated words of 1-8 alphanumeric characters each (for example cn, en-uk, no-bok, x-klingon, x-KlInGoN). If the first word is two or three -letters long, it is an ISO language code [[ISO 639]]. If the +letters long, it is an ISO language code [[BCP47]]. If the language tag is empty, the language is unspecified.
The translated keyword and text both use the UTF-8 encoding [[rfc3629]], @@ -7294,7 +7171,7 @@
Decoder colour calibrated RGB space or in a device-independent colour space such as XYZ. This will provide better colour fidelity than a simple RGB to CMYK conversion. The PostScript Language Reference manual -[[?POSTSCRIPT]] gives examples. Such decoders +[[?PostScript]] gives examples. Such decoders are responsible for implementing gamut mapping between source RGB (specified in the cHRM chunk) and the target printer. The @@ -7397,7 +7274,7 @@
Alpha channel -
This code is ISO C [[ISO-9899]], with line numbers added for +
This code is ISO C [[ISO 9899]], with line numbers added for reference in the comments below.
@@ -8500,7 +8377,7 @@Sample Cyclic Redundancy Code
The following sample code represents a practical implementation of the CRC (Cyclic Redundancy Check) employed in -PNG chunks. (See also ISO 3309 [[ISO 3309]] or ITU-T V.42 [[ITU-T-V42]] for a +PNG chunks. (See also ISO 3309 [[ISO 3309]] or ITU-T V.42 [[ITU-T V.42]] for a formal specification.)
The sample code is in the ISO C [[ISO 9899]] programming language. The @@ -8785,20 +8662,7 @@
ISO 3664:2000, Viewing conditions — Graphic technology and photography. - -[ITU-R BT.709] - -International Telecommunications Union, Basic Parameter -Values for the HDTV Standard for the Studio and for International -Programme Exchange, ITU-R Recommendation BT.709 (formerly CCIR -Rec. 709), 1990. - - -[ITU-T-V42] -International Telecommunications Union, Error-correcting -Procedures for DCEs Using Asynchronous-to-Synchronous -Conversion, ITU-T Recommendation V.42, 1994, Rev. 1. [KASSON] @@ -8827,13 +8691,6 @@
http://www.libpng.org/pub/png/pngbook.html- -[PAETH] - -Paeth, A.W., "Image File Compression Made Easy", in -Graphics Gems II, James Arvo, editor. Academic Press, San -Diego, 1991. ISBN 0-12-064480-0. -[PNG-1.0] @@ -8871,12 +8728,6 @@
https://w3c.github.io/PNG-spec/extensions/Overview.html- -[POSTSCRIPT] - -Adobe Systems Incorporated, PostScript Language Reference -Manual, 2nd edition. Addison-Wesley, Reading, 1990. ISBN -0-201-18127-4. [POYNTON] @@ -8885,13 +8736,6 @@Video. John Wiley and Sons, Inc., New York, 1996. ISBN 0-471-12253-X. - -
[SMPTE 170M] - -Society of Motion Picture and Television Engineers, -Television — Composite Analog Video Signal — NTSC -for Studio Applications, SMPTE 170M, 1994. -[STONE]