You must specify one of the following output options:

   -a: Targa                  --I: Alias PIX / Vivid IMG ---p: Adobe Photoshop
   -A: PCPaint/Pictor        ---i: MIFF                  ---P: US Patent Image
  --a: Autologic             ---I: IDRISI                 --q: Q0
  --A: ADEX                    -j: JPEG                   --Q: Img Software Set
 ---a: Alps                   --j: HSI JPEG              ---Q: Iris CT
 ---A: AVS X                  --J: Jovian VI               -r: HSI Raw
   -B: Binary (BIF)          ---j: Pixar PIC               -R: RIX
  --b: XBM                     -k: Portable BitMap (PBM)  --r: HP RTL
  --B: Core IDC                -K: Stork                  --R: AVHRR
  --c: CALS                   --k: Fargo Primera         ---r: Intergraph
  --C: Dr. Halo CUT           --K: Epson Stylus          ---R: RLC
 ---c: Pixel Power Collage     -l: HSI Palette             -s: Sun Raster
  --d: Adobe PDF               -L: Multi-Image Palette    --s: Scodl
  --D: QDV                    --l: Calcomp                --S: SPOT Image
   -e: EPS / PostScript       --L: Lumena CEL            ---s: Spaceward
  --e: Erdas LAN/GIS/IMG     ---l: Autodesk PIC/CEL      ---S: HP PhotoSmart
  --E: Verity Image Format     -m: Macintosh PICT          -t: TIFF
 ---E: JEDMICS CCITT4          -M: Alpha BMP               -T: VITec
  --f: FOP                    --m: ER Mapper Raster       --t: MacPaint
  --F: First Publisher        --M: MTV                    --T: QRT Raw
 ---F: FBM                   ---m: Mimaki MRL-1           --u: Utah RLE
   -g: GIF                   ---M: Imaging Technology     --U: Puzzle
  --g: Gem VDI Image           -n: SGI Image             ---v: VIFF
  --G: GOES                   --N: Sun Icon                -w: Windows BMP
 ---g: Raster Graphics       ---n: PNG                     -W: WPG
 ---G: Sharp GPB               -O: OS/2 BMP               --w: XWD
   -H: Histogram              --O: OS/2 Icon              --x: XPM
  --h: Hitachi Raster          -p: PCX                   ---x: XIM
  --H: HP-48sx                 -P: HP PCL                ---X: Scitex CT
   -i: IFF/ILBM               --p: PDS                   
  --i: IBM Picture Maker      --P: Cubicomp