Jukka Rahkonen wrote:
Craig Leat <craig.leat <at> gmail.com> writes:
Hi,
I have noted with gdal 1.6.1 that gdalwarp -of JPEG returns the error
message "Output driver `JPEG' not recognised or does not support
direct output file creation." However, gdal_translate -of JPEG works.
Is there any justifiable reason that gdalwarp does not support writing
JPEG or is wrapping JPEG inside GTiff the usually way of doing things?
Thanks for any insights,
Hi,
I believe that in warping process data needs to be written in arbitrary places
into the output image and that can be impossible or ineffective if the target
image is jpeg compressed. I guess it might be done somehow when simply warping
one whole image to another projection as it is, but gdalwarp can do other nice
things like warping from virtual mosaic or warp new data into an existing output
image. Let gdalwarp create an uncompressed tiff first and compress it to jpeg
afterwards. I bet it is also the fastest way do get the job done.
Craig,
Jukka is correct. There is a bit more information on this in the FAQ:
http://trac.osgeo.org/gdal/wiki/FAQRaster#Whywontgdalwarporgdal_mergewritetomostformats
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
_______________________________________________
gdal-dev mailing list
gdal-dev@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/gdal-dev
