A GIF image with transparency will have that entry marked as having an alpha value of 0.0 (transparent). Also, the transparent value will be returned as the NoData value for the band.
If an ESRI world file exists with the .gfw, .gifw or .wld extension, it will be read and used to establish the geotransform for the image.
Starting with GDAL 1.9.0, XMP metadata can be extracted from the file, and will be stored as XML raw content in the xml:XMP metadata domain.
WORLDFILE=ON: Force the generation of an associated ESRI world file (.wld).
Interlaced (progressive) GIF files can be generated by supplying the INTERLACING=ON option on creation.
Starting with GDAL 1.7.0, GDAL's internal GIF support is implemented based on source from the giflib 4.1.6 library (written by Gershon Elbor, Eric Raymond and Toshio Kuratomi), hence generating LZW compressed GIF.
The driver was written with the financial support of the DM Solutions Group, and CIET International.