4.2     File select dialogs
  On most platforms you can drag files from your file
manager directly to nip2’s main window. Alternatively, if
you select File / Open in the main window, nip2 will pop up a
file dialog, see Figure 4.4. The open dialog has the
following extra features:
  
    - 
Pin up button 
- Normally the file dialog closes after you
    have opened something. If this item is checked, the
    dialog will stay up instead — this is useful if you
    want to load or save a series of objects.
    
- 
Image type select 
- Use this menu to select the type of
    file you want nip2 to display. There’s a preference
    option to set the default image format. The VIPS
    file format is fast and accurate, but sadly not very
    widely  supported  (joke).  You  can  also  load  and
    save images in TIFF, JPEG, PNG, HDR, CSV and
    PBM/PGM/PPM formats. You can usually load in
    many more formats, it depends how your nip2 has
    been configured.
    
- 
Image info 
- This  displays  a  one-line  summary  of  the
    selected image, plus a large thumbnail.
    
  The save dialog adds one extra feature: Increment
filename.
  If pin up and increment are both selected, then after a
save nip2 will attempt to add one to the selected file name.
For example, if you save a file called fred001.v, after the save
nip2 will put the name fred002.v into the selected file name
box. Again, this is useful if you want to save a series of
images.