Le Wednesday 29 July 2009 20:46:47 Martin Chapman, vous avez écrit : > Good question. I imagine it is extra work for Frank that falls low on the > priority list. :)
Another problem is that if you want to create a big raster, it might not hold entirely into RAM (a JPEG file uncompressed into RAM can use up to 65000x65000x3=12 GB). The general GDAL policy is to minimize the use of RAM. > > Martin > > -----Original Message----- > From: Belaid MOA <[email protected]> > > Date: Wed, 29 Jul 2009 18:46:28 > To: <[email protected]>; <[email protected]> > Subject: RE: [gdal-dev] JPEG format. > > > > > > > > > > That's excellent to know! Thanks a lot Martin. Instead of getting > segfault, > I could use that to exist peacefully in case the driver does support the > Create() function. > > Just of out of curiosity, why JPEG driver does not have the create function > and only supports CreateCopy()? The Create() function could be easily > implemented using MEM and CreateCopy(); instead of relying on the user to > do this every time a JPEG driver is used. > > With best regards. > ~Belaid. > From: [email protected] > To: [email protected]; [email protected] > Subject: RE: [gdal-dev] JPEG format. > Date: Wed, 29 Jul 2009 11:56:04 -0600 > > > > > > > > > > > > > > > > > > > > Use: > > > > if > (!pDriver->TestCapability(ODrCCreateDataSource)) > > > > to > test create capabilties of the driver. > > > > I > think jpeg driver only supports CreateCopy(). > > > > You > could use the Memory dataset to create a different size dataset and then > use the jpeg driver to save it to disk. > > > > Martin > > > > > > > > From: > [email protected] [mailto:[email protected]] > On Behalf Of Belaid MOA > > Sent: Wednesday, July 29, 2009 11:45 AM > > To: [email protected] > > Subject: [gdal-dev] JPEG format. > > > > > > > > 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? Any example on how to use JPEG driver is appreciated. > > > > As always, any help on this is very appreciated. > > > > With best regards. > > ~Belaid > > > > > > > > Stay > in the loop and chat with friends, right from your inbox! Learn how! > > > _________________________________________________________________ > Stay in the loop and chat with friends, right from your inbox! > http://go.microsoft.com/?linkid=9671354 _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
