The encyclopedia · Software & IT · Technical decision · 1995–1998
Exif made camera settings travel inside the photo itself
JEIDA's 1995 Exif stores shutter speed, date, and camera model inside the JPEG's APP1 segment, so every viewer can show what the camera knew.
JEIDA · CIPA
the move
Digital cameras produced image files with pixels but no context: the shutter speed, aperture, and date were known at capture and then lost. JEIDA's Exchangeable Image File Format, first released in October 1995, fixed that by defining metadata tags for cameras.
The design borrowed the TIFF tag structure and stored it in JPEG's APP1 application segment, so an Exif image remains an ordinary JPEG that any browser can display, with the metadata hidden inside. Version 2, released in June 1998, added sRGB color space, compressed thumbnails, and audio support.
Exif won because the metadata travels with the file: it survives copying, email, and archives without a companion database, and photo software, print labs, and catalogues all read the same tags. Its tags now cover exposure, date, GPS location, and manufacturer settings.
why it works
- Embedding data in the file means it survives every copy and transfer.
- Sticking to JPEG's structure kept files universally displayable.
- Standard tags let any vendor's software read any camera's data.
- GPS and date tags turned ordinary photos into records.
what transfers
When information must travel with an artifact, put it inside the artifact: metadata embedded in the file survives where separate databases and sidecars get lost.
what came after
Exif became the standard metadata format for digital cameras and smartphones, managed by JEITA and CIPA, with version 3.0 released in 2023; photo libraries and forensic tools still read its tags.
references
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