[DOS] aide pour un freeware

J'ai un problème avec cet utilitaire (GDAL) qui permet de faire des changements de formats d'images. Mon problème est surtout que je ne comprend pas la synthaxe de l'aide.

Code:

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C:\Program Files\FWTools1.1.2>gdal_translate [--help-general]
Usage: gdal_translate [--help-general]
       [-ot {Byte/Int16/UInt16/UInt32/Int32/Float32/Float64/
             CInt16/CInt32/CFloat32/CFloat64}] [-not_strict]
       [-of format] [-b band] [-outsize xsize[%] ysize[%]]
       [-scale [src_min src_max [dst_min dst_max]]]
       [-srcwin xoff yoff xsize ysize] [-projwin ulx uly lrx lry]
       [-a_srs srs_def] [-a_ullr ulx uly lrx lry] [-a_nodata value]
       [-gcp pixel line easting northing [elevation]]*
       [-mo "META-TAG=VALUE"]* [-quiet] [-sds]
       [-co "NAME=VALUE"]*
       src_dataset dst_dataset

GDAL 1.4.0.0beta2, FWTools 1.1.2, released 2006/12/20

The following format drivers are configured and support output:
  VRT: Virtual Raster
  GTiff: GeoTIFF
  NITF: National Imagery Transmission Format
  HFA: Erdas Imagine Images (.img)
  ELAS: ELAS
  AAIGrid: Arc/Info ASCII Grid
  DTED: DTED Elevation Raster
  PNG: Portable Network Graphics
  JPEG: JPEG JFIF
  MEM: In Memory Raster
  GIF: Graphics Interchange Format (.gif)
  XPM: X11 PixMap Format
  BMP: MS Windows Device Independent Bitmap
  PCIDSK: PCIDSK Database File
  PCRaster: PCRaster Raster File
  ILWIS: ILWIS Raster Map
  GMT: GMT NetCDF Grid Format
  netCDF: Network Common Data Format
  HDF4Image: HDF4 Dataset
  PNM: Portable Pixmap Format (netpbm)
  ENVI: ENVI .hdr Labelled
  EHdr: ESRI .hdr Labelled
  PAux: PCI .aux Labelled
  MFF: Vexcel MFF Raster
  MFF2: Vexcel MFF2 (HKV) Raster
  BT: VTP .bt (Binary Terrain) 1.3 Format
  IDA: Image Data and Analysis
  JP2KAK: JPEG-2000 (based on Kakadu)
  ECW: ERMapper Compressed Wavelets
  JP2ECW: ERMapper JPEG2000
  FIT: FIT Image
  RMF: Raster Matrix Format
  RST: Idrisi Raster A.1
  USGSDEM: USGS Optional ASCII DEM (and CDED)

C:\Program Files\FWTools1.1.2>

la synthaxe que je ne comprend pas est en vert dans le code. Merci pour vos réponses