These meta characters can be used for typing additional captions into cropped files and for display
additional information in full screen preview and slideshow:
$F - for file name.
$D - for file date. (If there is EXIF info for file date the program will take it.)
$T - for file time. (If there is EXIF info for file time the program will take it.)
$S - for file size.
If your files have additional EXIF information you may use the following meta characters:
$XM - for camera model name.
$XS - for exposure time (i.e. shutter speed).
$XF - for apperture number.
$XI - for ISO speed number.
$XL - for focal length.
For a new line please use this meta character:
$P - for new line.