DCF Objects
DCF object is a standalone file with DCF filename (e.g. ABCD0001.JPG) or a file group that share the same file number. DCF objects are used for the files related with each other, such as the image file and the related audio file. Related files are handled together for the convenience of users. A DCF object need not include an image file. A standalone file for which no other file with the same file number exists is still a DCF object. Files in directories that are not located under a DCF directory are not DCF object components.
DCF specification defines files included in DCF objects:
- DCF basic file - an image file with filename extension ".JPG" conforming to the Exif specification; uses sRGB color space
- DCF optional file - an image file with filename extension ".JPG" conforming to the Exif specification, used when an image is to undergo extensive processing notably in professional uses; uses DCF optional color space
- DCF extended image file - a file with other filename extension and data structure than "JPG" or "THM".
- DCF thumbnail file - a thumbnail image file with filename extension ".THM", used for extended image file; uses sRGB color space and JPEG compression
Files not specified in DCF specification (with other extensions and data structures) may also be included in a DCF object (e.g. "TXT", "WAV", "TIF", etc.).
The rules for DCF object structure and elements prohibit the use of DCF thumbnail files for files with ".JPG" extension. They also prohibit the extension "JPG" for other than DCF basic files and DCF optional files.
One DCF directory may contain up to 9999 DCF objects, numbered from "0001" to "9999" (a.k.a. "File number").
Read more about this topic: Design Rule For Camera File System
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