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Database id of the depicted item (reflecting order of entry into the database)
Item's dimensions (as recorded in the database)
File size of the image of item
Date & time the image was taken according to the camera metadata (EXIF)
Focal length of the camera photographing the object (EXIF)
Exposure time of camera (EXIF)
F-number / Aperture value of camera (EXIF)
Relative amount of significantly blue pixels in the image based on its RGB data
Relative amount of significantly green pixels
 
 
Relative amount of significantly red pixels
Count of "frontal faces" (according to Haar-Cascade feature detection trained on a standard corpus of images)