The situation most business find is that their digital objects are sitting on one or more drives, and they need to find them all. They might want to sort out the good images from the bad ones before loading. If they were copied over from a Apple Macintosh computer, then the Mac header information will be copied as another file, in effect creating a ghost version of it.
If the Mac file is called
myimage.jpg, then when transferred to Window or Unix, the file
.myimage.jpg will also come across. This file is not a digital image but contains Apple Macintosh's specific-header information. It needs to be ignored.
A business might also want to ignore digital objects below a certain size or ignore those of a certain type. The challenge ...