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DCF standard
The DCF specification imposes the following conditions.
Limits on directory names
Directories must be created within the main DCIM directory.
• Data which is contained within any directory other than the DCIM
directory cannot be recognised.
Directory names must consist of three numerals (directory
number) followed by five alphanumeric characters. (Example:
100abcde)
• The three numerals must make up a number between 100 and 999, and
the alphanumeric characters can be taken from the following set of 37
characters: 0123456789abcdefghijklmnopqrstuvwxyz_ (No distinction is
made between upper-case and lower-case alphabetic characters.
Double-byte characters cannot be used.)
Multiple directories using the same three-digit combination
(directory number) cannot be created.
Directory sub-hierarchies are not supported.
File names
File names must consist of four alphanumeric characters
followed by four numerals (file number), followed by “.jpg”.
(Example: abcd0001.jpg)
• The four numerals must make up a number between 0001 and 9999, and
the alphanumeric characters can be taken from the following set of 37
characters: 0123456789abcdefghijklmnopqrstuvwxyz_ (No distinction is
made between upper-case and lower-case alphabetic characters.
Double-byte characters cannot be used.)
Multiple file names using the same four-digit combination (file
number) cannot be created.
File format
Only JPEG image files which comply with the Exif 2.1 standard
are recognised.