19DCF standardThis projector can only play back image files which comply with the DCF specifica-tion. The DCF specification imposes the following conditions. Image files or directo-ries which do not conform to these conditions cannot be recognised by the projector.Limits on directory namesDirectories must be created as sub-directories of the DCIM directory onthe SD memory card.B Data which is contained within any directory other than the DCIM directorycannot be recognised.Directory names must consist of three numerals (directory number)followed by five alphanumeric characters. (Example: 100abcde)B The three numerals must make up a number between 100 and 999, andthe alphanumeric characters can be taken from the following set of 37characters: 0123456789abcdefghijklmnopqrstuvwxyz_ (No distinction ismade between upper-case and lower-case alphabetic characters. Double-byte characters cannot be used.)Multiple directories using the same three-digit combination (directorynumber) cannot be created.B For example, if two directories exist named "100abcde" and "100fghij"respectively, the projector will not recognise them.Directory sub-hierarchies are not supported.B For example, if a directory called "323fghij" is created as a sub-directory of the"102abcde" directory, the projector will not be able to recognise the sub-directory.File namesFile names must consist of four alphanumeric characters followed byfour numerals (file number), followed by ".jpg". (Example: abcd0001.jpg)B The four numerals must make up a number between 0001 and 9999, andthe alphanumeric characters can be taken from the following set of 37characters: 0123456789abcdefghijklmnopqrstuvwxyz_ (No distinction ismade 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.B For example, if two files exist named "abcd0001.jpg" and "efgh0001.jpg"respectively, the projector cannot recognise them normally.File formatB Only JPEG image files which comply with the Exif 2.1 standard arerecognised.