[Freegis-list] Creating JPEG images with gdal
tzajc at conae.gov.ar
Tue Oct 31 21:52:52 CET 2006
Correctme if I'm wrong. I can't use gdal to export an image I have on memory
(ie. on an array). I want to open an existin file usin gda or reading a raw
data (manualy) make some modifications (filtering, resampling, etc) and
export as JPEG. Maybe I should just use the plain jpg library to dump my
array on a file.
On Tuesday 31 October 2006 16:34, Frank Warmerdam wrote:
> Tomas Zajc wrote:
> > Hi. I hope this is the right place to make this question. I'm taking my
> > first steps with the gdal library on C and almost my first steps in C
> > programming. I'm truing to creta some small jpg's using gdal.
> > I know there are two methods for generating images using gdal:
> > GDALCreateCopy and GDALCreate.
> > I made a small program in which you can specify the driver at execution
> > time. When I use GTiff i get no problems. If I try to use JPEG I get:
> > "ERROR 6: GDALDriver::Create() ... no create method implemented for this
> > format."
> > I'm a bit lost, http://www.gdal.org/formats_list.html says JPEG can be
> > used for creation.
> JPEG and most drivers for compressed formats in GDAL only support the
> CreateCopy() mechanism. The formats list document means creation using
> one of Create() or CreateCopy(), and isn't meant to imply random writing
> is supported (as is the case with Create()).
> Best regards,
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