Contents 1 New Tags 2 Differences from TIFF and Exif 3 Compression 4 Timeline for development and revision 5 See also 6 References 7 External links

New Tags[edit] The following new tags are defined in the TIFF/EP standard, all to be placed in the first TIFF Image File Directory (IFD) TIFF/EP Tag# Tag Name 014A16 SubIFDs 015B16 JPEGTables 828D16 CFARepeatPatternDim 828F16 BatteryLevel 83BB16 IPTC/NAA 877316 InterColorProfile 882916 Interlace 882A16 TimeZoneOffset 882B16 SelfTimerMode 920D16 Noise 921116 ImageNumber 921216 SecurityClassification 921316 ImageHistory 921616 TIFF/EPStandardID

Differences from TIFF and Exif[edit] There are no major departures by the TIFF/EP standard from the TIFF standard, except that many of the TIFF tags are ignored. The TIFF/EP standard does however have a few notable differences from the Exif standards: All tags used by TIFF/EP which are defined by the Exif standard to reside within the Exif Sub-IFD now reside directly under the first (main) TIFF IFD. The Exif IFD Sub-IFD, Interoperability Sub-IFD and the MakerNote Tag have all been omitted. Unlike the TIFF 6.0 standard, the TIFF/EP standard defines a method of dealing with thumbnail images. This however is different from the method that is used in the Exif standard. Several tags defined by the Exif standard have been re-defined in the TIFF/EP standard – see table below. TIFF/EP Tag# Exif Tag# Tag Name 920B16 A20B16 FlashEnergy 920C16 A20C16 SpatialFrequencyResponse 920E16 A20E16 FocalPlaneXResolution 920F16 A20F16 FocalPlaneYResolution 921016 A21016 FocalPlaneResolutionUnit 921416 A21416 SubjectLocation 921516 A21516 ExposureIndex 921716 A21716 SensingMethod 828E16 A30216 CFAPattern

Compression[edit] Images in TIFF/EP files may be stored in uncompressed form, or using JPEG baseline DCT-based lossy compression. TIFF/EP also allows usage of other compression methods, but TIFF/EP readers are not required to decompress these images. All TIFF/EP readers shall support the DCT (lossy) baseline version of the TIFF/JPEG compression method described in TIFF 6.0 Technical note #2. The JPEG compression is indicated using a value of 000716 in the Compression tag-field as a binary value.[4] There may be more than one image (subfile) in a TIFF 6.0 file. Each subfile is defined by Image File Directory (IFD). If an image compression method is used in TIFF/EP, an uncompressed Baseline TIFF-readable "thumbnail" image (with a reduced-resolution) should also be stored in the 0th IFD of TIFF/EP, to allow the images to be viewed and identified using a Baseline TIFF 6.0 reader. (Note: JPEG compression is not required for Baseline TIFF 6.0 readers.)[4] TIFF/EP files may optionally use lossless JPEG compression and other JPEG compressions, but TIFF/EP readers are not required to decompress these images. If the lossless JPEG compression is used, the recommended form is lossless sequential DPCM using Huffman coding. TIFF/EP files may also optionally support vendor unique compression, but TIFF/EP readers are only required to open the uncompressed "thumbnail" image that may be present in IFD0. Proprietary compression methods can be used by obtaining a private compression tag value from the TIFF administrator (Adobe).[4] TIFF/EP complies with the TIFF 6.0 specification. The reason is to maintain compatibility with existing TIFF readers, and to make the adoption of TIFF/EP as easy as possible. The TIFF Tag 259 (010316) stores the information about the Compression method. Its use is mandatory in TIFF/EP. There is no default value in TIFF/EP, but the tag value shall equal "000116" for the thumbnail IFD. The following is a list of defined TIFF/EP compression schemes:[4] See also: TIFF § TIFF Compression Tag TIFF/EP Compression Tag values Tag value Compression scheme Description 000116 Uncompressed Shall be supported by TIFF/EP readers; shall be used for the thumbnail IFD; may be used for images 000716 TIFF/JPEG compression ('new-style' JPEG) TIFF/EP readers are only required to support Baseline DCT JPEG method Other values > 7FFF16 Vendor unique compression methods TIFF/EP readers are not required to support these compressions

Timeline for development and revision[edit] Dates limited to publicly available sources: Date Event 1998 A DIS (Draft International Standard) of TIFF/EP was available from ISO.[5][6] 2001 TIFF/EP was ratified and published by ISO as an International Standard.[7] 2006 TIFF/EP began its 5-year revision cycle by ISO Working Group WG18.[8] 2007 (March) An email from WG18 stated "The Adobe DNG format was derived from this standard and the group has Adobe's permission to incorporate modifications and developments made for DNG in the new standard".[9] 2008 (May) There was further confirmation that Adobe had offered the DNG specification to ISO as part of ISO's TIFF/EP standard.[10] 2008 (September) Minutes of ISO/TC 130/WG2 — Prepress Data Exchange, 37th Meeting: "WG 18 is revising the two-part standard (ISO 12234), which addresses digital camera removable memory. The revision of Part 1 will add JPEG2000; the revision of Part 2 will add DNG into TIFF/EP."[11] 2009 (September) Minutes of ISO/TC 130/WG2 — Prepress Data Exchange, 39th Meeting: the revision "is comprehensive to support many different use cases, including backward compatibility with current TIFF readers and support of Adobe DNG. There are two interoperability profiles defined: Profile 1 (proposed extension .tif) will provide an intended output-referred interpretation (reproduction color appearance), supporting any color encoding that can be supported using an ICC profile, including output-referred, scene-referred, and demosaiced camera raw... Profile 2 (proposed extension .dng, if Adobe is in agreement) is intended for camera raw images, including un-demosaiced images... This format will be similar to DNG 1.3, which serves as the starting point for development."[12]

See also[edit] Tagged Image File Format (TIFF) Exchangeable image file format (Exif) Design rule for Camera File system International Organization for Standardization List of ISO standards

References[edit] ^ Pearson, Barry, What is in a raw file?, UK . ^ Adobe: DNG Specification (June 2009) (scroll down a bit) ^ Pearson, Barry, Products from camera manufacturers that use DNG in some way, UK . ^ a b c d ISO/DIS 12234-2 - Photography — Electronic still picture imaging — Removable memory — Part 2: Image data format — TIFF/EP (PDF), 1998, Archived from the original on February 12, 2006, retrieved 2011-03-08 CS1 maint: Unfit url (link) ^ Link to a copy of the 1998 draft standard ^ DIS (PDF) (draft standard), UK: Barry Pearson, 2000 . ^ ISO: ISO 12234-2:2001 ^ I3A (International Imaging Industry Association): WG18, Ad Hoc groups and JWG 20/22/23 Meet in Tokyo ^ Web archive of widely distributed email: Forwarded Message from a member of the ISO TC42 (technical committee for photography) working group 18 (electronic imaging) standards group ^ DPReview: Adobe seeks International recognition for DNG ^ NPES: Minutes of ISO/TC 130/WG2, 37th Meeting, see 14f ^ NPES: Minutes of ISO/TC 130/WG2, 39th Meeting, see 14f

External links[edit] ISO 12234-2:2001 Electronic still-picture imaging – Removable memory – Part 2: TIFF/EP image data format Link to a copy of the 1998 draft standard v t e Graphics file formats Raster ANI ANIM APNG ART BMP BPG BSAVE CAL CIN CPC CPT DDS DPX ECW EXR FITS FLIC FLIF FPX GIF HDRi HEVC ICER ICNS ICO / CUR ICS ILBM JBIG JBIG2 JNG JPEG JPEG-LS JPEG 2000 JPEG XR JPEG XT JPEG-HDR KRA MNG MIFF NRRD ORA PAM PBM / PGM / PPM / PNM PCX PGF PICtor PNG PSD / PSB PSP QTVR RAS RGBE Logluv TIFF SGI TGA TIFF TIFF/EP TIFF/IT UFO/ UFP WBMP WebP XBM XCF XPM XWD Raw CIFF DNG Vector AI CDR CGM DXF EVA EMF Gerber HVIF IGES PGML SVG VML WMF Xar Compound CDF DjVu EPS PDF PICT PS SWF XAML Related Exchangeable image file format (Exif) Extensible Metadata Platform (XMP) Category Comparison v t e ISO standards by standard number List of ISO standards / ISO romanizations / IEC standards 1–9999 1 2 3 4 5 6 7 9 16 31 -0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 128 216 217 226 228 233 259 269 302 306 428 518 519 639 -1 -2 -3 -5 -6 646 690 732 764 843 898 965 1000 1004 1007 1073-1 1413 1538 1745 1989 2014 2015 2022 2047 2108 2145 2146 2240 2281 2709 2711 2788 2848 2852 3029 3103 3166 -1 -2 -3 3297 3307 3602 3864 3901 3977 4031 4157 4217 4909 5218 5428 5775 5776 5800 5964 6166 6344 6346 6385 6425 6429 6438 6523 6709 7001 7002 7098 7185 7200 7498 7736 7810 7811 7812 7813 7816 8000 8178 8217 8571 8583 8601 8632 8652 8691 8807 8820-5 8859 -1 -2 -3 -4 -5 -6 -7 -8 -8-I -9 -10 -11 -12 -13 -14 -15 -16 8879 9000/9001 9075 9126 9293 9241 9362 9407 9506 9529 9564 9594 9660 9897 9899 9945 9984 9985 9995 10000–19999 10005 10006 10007 10116 10118-3 10160 10161 10165 10179 10206 10218 10303 -11 -21 -22 -28 -238 10383 10487 10585 10589 10646 10664 10746 10861 10957 10962 10967 11073 11170 11179 11404 11544 11783 11784 11785 11801 11898 11940 (-2) 11941 11941 (TR) 11992 12006 12182 12207 12234-2 13211 -1 -2 13216 13250 13399 13406-2 13450 13485 13490 13567 13568 13584 13616 14000 14031 14224 14289 14396 14443 14496 -2 -3 -6 -10 -11 -12 -14 -17 -20 14644 14649 14651 14698 14750 14764 14882 14971 15022 15189 15288 15291 15292 15398 15408 15444 -3 15445 15438 15504 15511 15686 15693 15706 -2 15707 15897 15919 15924 15926 15926 WIP 15930 16023 16262 16612-2 16750 16949 (TS) 17024 17025 17100 17203 17369 17442 17799 18000 18004 18014 18245 18629 18916 19005 19011 19092 (-1 -2) 19114 19115 19125 19136 19439 19500 19501 19502 19503 19505 19506 19507 19508 19509 19510 19600:2014 19752 19757 19770 19775-1 19794-5 19831 20000+ 20000 20022 20121 20400 21000 21047 21500 21827:2002 22000 23270 23271 23360 24517 24613 24617 24707 25178 25964 26000 26300 26324 27000 series 27000 27001 27002 27006 27729 28000 29110 29148 29199-2 29500 30170 31000 32000 38500 40500 42010 55000 80000 -1 -2 -3 Category Retrieved from "" Categories: ISO standardsGraphics file formatsHidden categories: CS1 maint: Unfit url

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