16. Why can't I save and view JPEG image files on my camera?

The JPEG standard has a number of variations which were created for specific reasons. This page explains the differences between two common formats: JFIF and EXIF.

The differences are due to the additional supplementary information which is added to the original image, for example the shooting conditions of the camera, global positioning system (GPS) information and so on. This data is usually stored in an areas that are called "APPn" (where "n" is the number 0,1,2 etc).

JFIF

The JFIF variation is commonly used in the imaging industry. Most software applications save files in this format. JFIF uses the APPn areas to store information such as copyright and captions (IPTC text) and profile information for colour management (icm data).

EXIF

The EXIF format was created for use in Digital Cameras. It specifies the APPn areas to store information such as the state of the camera (shutter, aperture white balance etc) when the image was recorded and GPS data if supported.

Most imaging software applications can open both types of JPEG file, but most digital cameras can only display EXIF format images. When a  EXIF file is opened in an imaging program like Photoshop™ and then saved, the file is changed into a JFIF format with a result that the image can no longer be opened by the camera and the shooting data is lost.

(Nikon Capture for the D-1 is able to save images in EXIF or JFIF format)

For infomation on EXIF, please see:http://www.jeida.or.jp/document/standard/jeida49.html#english.