EXIFEXIF

EXchangeable Image File Format

By Janett Niendorf

Computational Photography (Project, Summer 2009) @TU Berlin List of tags

metadata of the picture

Exif data – Janett Niendorf 2 Additional information

ImageDescription - Alf (TV-Series, USA 1986-1990) wearing Alf-Costume and Benji Gregory

CopyrightInformation - --- IMPORTANT: To be used solely for coverage of this specific motion picture/tv programme

Artist - Cinetext Bildarchiv

Exif data – Janett Niendorf 3 Embedded Thumbnails

- preview

-changes

Some image manipultion software fails to update the thumbnail.

Exif data – Janett Niendorf 4 About the 'standard'

● Uses existing specifications JPEG and TIFF ● Not supported in JPEG2000, PNG or GIF ● Created by JEIDA (Japan Electronic Industries Development Association) which is no standardization institute ● Wide use by manufactors of digital cameras ● Latest version 2.21 dated 2003

Exif data – Janett Niendorf 5 Related 'standards'

Metadata

Exif IPTC XMP (IIM) Metadata Working Group

Exif data – Janett Niendorf 6 Geocoding

Exif data – Janett Niendorf 7 Compressed file structure

attribute information of primary image

thumbnail information

- size of application segment 1 (APP1) is restricted to 64kB

Exif data – Janett Niendorf 8 Uncompressed file structure

- uncompressed RGB data is recorded in conformance with baseline TIFF Rev. 6.0

- Attribute information specific to Exif is recorded using private tags reserved in TIFF for this standard - private tags point to sets of this attribute information (Exif IFD)

- uses offset pointers

- !Software may damge pointer-structure

Exif data – Janett Niendorf 9 Disadvantages

● Photo manipulation software fails to update the embedded thumbnail ● Image size higher with metadata ● Global positioning vs. privacy ● Time stamp says where u were

Exif data – Janett Niendorf 10 Abbreviations

..that may confuse you while reading about Exif. Exif Exchangeable Image File Format MWG Metadata Working Group IPTC International Press Telecommunications Council XMP Extensible Metadata Platform JEIDA Japan Electronic Industries Development Association IIM Information Interchange Model IFD Image File Directory DCF Design rule for Camera File system TIFF/EP Tag Image File Format / Electronic Photography DSC Digital Still Camera JPEG Joint Photographic Experts Group JFIF JPEG File Interchange Format

Exif data – Janett Niendorf 11 List of Sources

● Wikipedia http://en.wikipedia.org/wiki/Exif, viewed 06.05.2009

● Exif 2.2 Specification http://www.exif.org/Exif2-2.pdf

Software

● IrfanView Exif Plugin (read Exif data, HEXview) ● ExifTool (commandline-tool for reading/writing Exif data) ● Picasa & Google Earth (geo-tagging)

Exif data – Janett Niendorf 12