Last modified: Mon Feb 11 10:59:52 UTC+0100 2019 © A. Tarpai

JPEG file formats

• JIF
• JFIF
• Exif

JIF - JPEG Interchange Format (Annex B of ITU T.81 1992)

• a general byte format
• quite free with little limitation (number of components)
• no 'color information' at all

                 |                                             |
+-----+----+-----+----+-----+----------------------------------+-----+
| SOI | [] | SOF | [] | SOS |ECS.....RST.ECS......RST.ECS......| EOI |
+-----+----+-----+----+-----+----------------------------------+-----+
                 |                                             |

JFIF - based on JIF

• "mandatory presence of the APP0 marker right after the SOI marker"
• metadata + thumbnail
• strongly recommends the JPEG baseline process
• one or three components: for three components, YCbCr (CCIR 601-256 levels)

Exif - based on JIF

• APP1 right after SOI
• lots of metadata