frmt_gif.html
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<html><head><title>GIF -- Graphics Interchange Format</title></head><body bgcolor="#ffffff"><h1>GIF -- Graphics Interchange Format</h1>GDAL supports reading and writing of normal, and interlaced GIF files. Giffiles always appear as having one colormapped eight bit band. GIF files haveno support for georeferencing.<p>A GIF image with transparency will have that entry marked as havingan alpha value of 0.0 (transparent). Also, the transparent value willbe returned as the NoData value for the band.<p>If an ESRI world file exists with the .wld extension, it will be read andused to establish the geotransform for the image.<p><h2>Creation Issues</h2>GIF files can only be created as 1 8bit band using the "CreateCopy" mechanism.If written from a file that is not colormapped, a default greyscale colormapis generated. Tranparent GIFs are not currently supported on creation.<p><b>WORLFILE=ON</b>: Force the generation of an associated ESRI worldfile (.wld).<p>Interlaced (progressive) GIF files can be generated by supplying the <b>INTERLACING=ON</b> option on creation. <p>By default GDAL does not support the creation of LZW compressed GIF filesdue to the usual LZW patent issues; however, it is possible to build GDALfrom source with LZW compression support if the LZW supporting version of<b>giflib</b> is installed.<p>GDAL's GIF support is implemented based on source from the libungif 4.0 librarywritten by Gershon Elbor, Eric Raymond and Toshio Kuratomi. It was writtenwith the financial support of the <a href="http://www.dmsolutions.ca/">DMSolutions Group</a>, and <a href="http://www.ciet.org/">CIET International</a>.<p>See Also:<p><ul><li> <a href="http://prtr-13.ucsc.edu/~badger/software/libungif/">Libungif HomePage</a><p></ul></body></html>⌨️ 快捷键说明
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