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.
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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