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<html><head><title>GTiff -- GeoTIFF File Format</title></head><body bgcolor="#ffffff"><h1>GTiff -- GeoTIFF File Format</h1>Most forms of TIFF and GeoTIFF files are supported by GDAL for reading, andsomewhat less varieties can be written.<p>Currently band types of Byte, UInt16, Int16, UInt32, Int32, Float32, Float64, CInt16, CInt32, CFloat32 and CFloat64 are supported forreading and writing. Paletted images will return palette information associated withthe band. The compression formats listed below should be supported forreading as well. <p>As well, one bit files, and some other unusual formulations of GeoTIFF file,such as YCbCr color model files, are automatically translated into RGBA(red, green, blue, alpha) form, and treated as four eight bit bands. <p><h2>Georeferencing</h2>Most GeoTIFF projections should be supported, with the caveat that in orderto translate uncommon Projected, and Geographic coordinate systems into OGC WKT it is necessary to have the EPSG .csv files avalable. They mustbe found at the location pointed to by the GEOTIFF_CSV environment variable.<p>Georeferencing from GeoTIFF is supported in the form of one tiepoint andpixel size, a transformation matrix, or a list of GCPs.<p>If no georeferencinginformation is available in the TIFF file itself, GDAL will also check for,and use an ESRI <a href="frmt_various.html#WLD">world file</a> with theextention .tfw, .tiffw or .wld, as well as a MapInfo .tab file (only controlpoints used, Coordsys ignored).<P><h2>Creation Issues</h2>GeoTIFF files can be created with any GDAL defined band type, includingthe complex types. Created files may have any number of bands. Files with exactly 3 bands will begiven a photometric interpretation of RGB, files with exactly four bandswill have a photometric interpretation of RGBA, while all other combinations will have a photometric interpretation of MIN_IS_WHITE. Files withpseudo-color tables, or GCPs can currently only be created when creating from an existing GDAL dataset with those objects (GDALDriver::CreateCopy()).<p>Creation Options:<p><ul><li> <b>TFW=YES</b>: Force the generation of an associated ESRI worldfile (.tfw).See a <a href="frmt_various.html#WLD">World Files</a> sectionfor details.<p><li> <b>INTERLEAVE=[BAND,PIXEL]</b>: By default TIFF files with bandinterleaving (PLANARCONFIG_SEPARATE in TIFF terminology) are created. Theseare slightly more efficient for some purposes, but some applications only support pixel interleaved TIFF files. In these cases pass INTERLEAVE=PIXELto produce pixel interleaved TIFF files (PLANARCONFIG_CONTIG in TIFFterminology).<p><li> <b>TILED=YES</b>: By default stripped TIFF files are created. Thisoption can be used to force creation of tiled TIFF files.<p><li> <b>BLOCKXSIZE=n</b>: Sets tile width, defaults to 256.<p><li> <b>BLOCKYSIZE=n</b>: Set tile or strip height. Tile height defaults to256, strip height defaults to a value such that one strip is 8K or less. <p><li> <b>COMPRESS=[JPEG/LZW/PACKBITS/DEFLATE/NONE]</b>: Set the compressionto use. JPEG should only be used with Byte data. None is the default.<p><li> <b>PREDICTOR=[0/1/2]</b>: Set the predictor for LZW or DEFLATE compression. The default is 0 (no predictor), 1 is horizontal differencing and 2 is floating point prediction.<p><li> <b>JPEG_QUALITY=[1-100]</b>: Set the JPEG quality when using JPEG compression. A value of 100 is best quality (least compression), and 1 is worst quality (best compression). The default is 75.<p><li> <b>PROFILE=[GDALGeoTIFF/GeoTIFF/BASELINE]</b>: Control what non-baselinetags are emitted by GDAL. With <tt>GDALGeoTIFF</tt> (the default) various GDAL custom tags may be written. With <tt>GeoTIFF</tt> only GeoTIFF tagswill be added to the baseline. With <tt>BASELINE</tt> no GDAL or GeoTIFFtags will be written. BASELINE is occationally useful when writing files tobe read by applications intolerant of unrecognised tags.<p><li><b>PHOTOMETRIC=[MINISBLACK/MINISWHITE/RGB/CMYK/YCBCR/CIELAB/ICCLAB/ITULAB]</b>: Set the photometric interpretation tag. Default is MINISBLACK, but if theinput image has 3 or 4 bands of Byte type, then RGB will be selected. You canoverride default photometric using this option.<p><li> <b>ALPHA=YES</b>: The first "extrasample" is marked as being alpha ifthere are any extra samples. This is necessary if you want to producea greyscale TIFF file with an alpha band (for instance). <p></ul>GeoTIFF supports internal creation of overviews (with gdaladdo for instance).See Also:<p><ul><li> <a href="http://www.remotesensing.org/geotiff/geotiff.html">GeoTIFF Information Page</a><li> <a href="http://www.remotesensing.org/libtiff/">libtiff Page</a></ul></body></html>⌨️ 快捷键说明
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