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

[Jorge Arévalo]

On Wed, Jan 12, 2011 at 6:30 PM, Antonio P <aperezcarro at yahoo.es> wrote:
> Hello :
> (I dont know if this email are going to be accepted by the list manager. So,
> this is a 'test' )
> I have a question about gdal_warp and gdal_translate utilities.
> I want to re-scale to 50% a serie of images.
> I cannot use gdal_translate with % outsize parameters
>       gdal_translate -of JPEG  -outsize 25% 25% DSC02699.jpg 02699.jpg
>>> does nothing (i view the options of gdal_translate)
> What kind of resampling method use gdal_translate?
>
> I 'd like to use gdal_warp simply to rescale an image to 50% 50% ? Can
> anyone tell me the command line syntax ?
>
> 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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Hi Antonio,

What does exactly mean "does nothing"? Don't show an error message?

Are you putting the source and destination files in the right place?
First source and then destination.

gdal_translate -of JPEG -outsize 50% 50% source_file.jpg dst_file.jpg

You can read the doc page for gdal_translate here:
http://www.gdal.org/gdal_translate.html, and more stuff at
http://www.gdal.org/

Best regards,
-- 
Jorge Arévalo
Internet & Mobilty Division, DEIMOS
jorge.arevalo at deimos-space.com
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