Special thanks Even. You are always quick and to the point! Thank you very
much.
As you pointed out, I was handling JPEG in the same manner as GTiff; I did not
use the MEM driver first.
With best regards.
~Belaid.
> From: [email protected]
> To: [email protected]
> Subject: Re: [gdal-dev] JPEG format.
> Date: Wed, 29 Jul 2009 19:55:46 +0200
> CC: [email protected]
>
> Le Wednesday 29 July 2009 19:44:41 Belaid MOA, vous avez écrit :
> > Hi Everyone,
> > When I try to use GDALCreate() on the JPEG driver, I got the following
> > error: "GDALDriver::Create() ... no create method implemented for this
> > format." Does is this mean that JPEG driver does not have its GDALCreate()
> > function implemented?
>
> Hum, I can admit that sometimes error messages are not particularly clear,
> but
> here .... !
>
> > Any example on how to use JPEG driver is appreciated.
>
> The JPEG is no different from other drivers. The fact that the Create()
> method
> is not implemented just reflect the fact that you can't write data at random
> scanlines in a JPEG file, it must be created scanline by scanline, from top
> to bottom. So you want to use the CreateCopy() method instead. As a source
> raster for the CreateCopy(), you can use a dataset created with the MEM
> driver (that supports the Create() method), or any other disk-based format
> like GTIFF that supports the Create() method.
>
> Schematically (in Python) :
>
> mem_ds = gdal.GetDriverByName('MEM').Create(....)
> mem_ds.WriteRaster(....)
>
> jpeg_ds = gdal.GetDriverByName('JPEG').CreateCopy(mem_ds, "out.jpg")
> jpeg_ds = None
> mem_ds = None
>
> >
> > As always, any help on this is very appreciated.
> >
> > With best regards.
> > ~Belaid
> >
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