[gdal-dev] Test and a question about gdal_warp and gdal_translate

[Antonio P]

Hello again : ( I dont know if my question was sent to the list ....)

I cannot use gdal_translate with % outsize parameters :

      gdal_translate -of JPEG  -outsize 25% 25% DSC02699.jpg 02699.jpg        
      >> does nothing (I view the use options of gdal_translate, it seems as I wrote a wrong parameter )
      gdal_translate -of JPEG  -outsize 25 25 DSC02699.jpg 02699.jpg     works ok (I get a 25 x25 pixels image)
     
      I use gdal 7.7.0b2 provided by FWTools 2.4.7

Any idea ? 


Also , I 'd like to use gdal_warp simply to rescale an image to 50% 50% ? Can anyone tell me the command line syntax ?
(i'd like to use  resampling options ...)

And .... I miss more information, more examples or more tutorials on how to use the command line utilities. Any good link ?
Thanks , Antonio

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