JEITA  CP-3451 - 3 - 3.4 Relation between Image and Audio File Specification   This standard includes specifications not only for an image file format but also for an audio file format enabling the recording of audio as a supplementary function. Also specified in this standard is the relational information indicating the relation between image files and audio files. Mapping between image files and audio files can be done in various ways; but the Exif standard specifies only the simplest mapping, with others left up to the implementation. 3.5 Presupposed Systems and Compatibility The image systems presupposed by this standard consist of three elements as follows: ·  Equipment:                      Imaging devices such as cameras, printers and filing equipment, ·  Commercial software:   Off-the-shelf image processing software running on personal computers, ·  Specialized software:    Dedicated (system-specific) image processing software running on personal computers. Image file compatibility on these systems is achieved as follows. The DSC or other system writes data to files in the format specified in this standard. A basic condition of equipment with a playback function is that it be able to read the files it recorded itself. In a personal computer environment, the basic requirement is that dedicated software be able to read all the images, audio and attribute information recorded in conformance with this standard (see Figure 2). Figure 2 Compatibility Concepts Exif Equipment  1   Exif Equipment 2 Writing Range Reading Range Conversion Other formats (Flashpix) Commercial Software Exif Specialized Software Exif Format