A method for selecting one of a plurality of master files comprising data encoding at least one scanned image, wherein the master file is created by scanning an original and thereby generating a stream of data, encoding a scanned image, and saving the scanned image in a master file, the method comprising:
- providing at least part of a thumbnail file associated with one of the master files to an archive manager, said part of the thumbnail file including data encoding a preview image corresponding to the scanned image with a lower data size than the scanned image, whereby the archive manager can display the parts as survey previews to the user for selection,
- wherein the data encoding the preview image is extracted from the stream of data on the fly and is written to a thumbnail file, thereby creating the preview image.