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I have successfully georeferenced a raster file via the Georeferencer plugin (Georeferencer GDAL Version 3.1.9) in QGIS 1.7.0.

However, I noticed that the output georeferenced raster file is in TIFF format. Is there a way for me to change it to something like JPEG (or others) to save disk space and memory usage? Thanks.

BTW, I am running this in Mac OS X 10.6.7.

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up vote 2 down vote accepted

Yes, after georeferencing, use the Raster > Translate tool (also called gdal_translate in GDAL's CLI) available in the GdalTools Plugin. I don't know if it is possible to select other raster formats within the Georeferencer plugin.

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I got the error "The process failed to start. Either the invoked program is missing, or you may have insufficient permissions to invoke the program.", what does that mean? Thanks. –  hpy Apr 25 '11 at 14:27
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@penyuan: Is this related to the Raster > Translate process? You need to make sure that GDAL is installed and your GDAL Tools plugin is configured to use the GDAL binaries. The setting option is available at Raster > GDALTool Settings. –  maning Apr 26 '11 at 2:18
    
Yes that did it. The trick is to download and install the GDAL frameworks from the KyngChaos site and set the path per the installer's directions. Thanks! –  hpy Apr 26 '11 at 15:37
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i'm thinking JPEG (the common form) is not a file type which supports georeferenced metadata. You should be happy with TIFF. The other option is create a world file which goes with the image.

see raster in http://en.wikipedia.org/wiki/GIS_file_formats

Perhaps you are considering GeoTagging JPEG files to give them a location along a path?

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I would be OK with an associated world file, but how do I create one in QGIS to go with the georeferenced image? BTW, the "create world file" option is only available when I choose linear transformation, which is not what I want in this case. Thanks for your answer. –  hpy Apr 25 '11 at 14:21
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