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
Multiple directories using the same
Directory
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
Multiple file names using the same
File format
Only JPEG image files which comply with the Exif 2.1 standard are recognised.