Libtiff

Libtiff (http://www.libtiff.org/) är ett funktionsbibliotek i ANSI C för hantering av TIFF-bilder.Det är fri programvara och underhålls av medlemmarna på en sändlista via ett gemensamt CVS-arkiv.Ursprungligen skapades libtiff av Sam Leffler på Silicon Graphics, som gett sitt tillstånd till fri spridning av programvaran.Förutom funktionsbiblioteket libtiff ingår även fler färdiga standardprogram i paketet.

• Färdig binär ingår i standardinstallationen av Red Hat Linux och finns som RPM.
• Färdig binär för Windows finns från GnuWin32.

Standardprogram

• tiffinfo(1) - Display information about one or more TIFF files.
• tiffdump(1) - Display the verbatim contents of the TIFF directory in a file (its very useful for debugging bogus files that you may get from someone that claims they support TIFF)
• tiffcp(1) - Copy, concatenate, and convert TIFF images (e.g. switching from Compression=5 to Compression=1)
• tiff2ps(1) - Convert TIFF images to PostScript
• tiffcmp(1) - Compare the contents of two TIFF files (it does not check all the directory information, but does check all the data)
• tiff2bw(1) - A simple program to convert a color image to grayscale
• ras2tiff(1) - A quick hack that converts Sun rasterfile format images to TIFF -- its less than complete
• rgb2ycbcr(1) - Convert an RGB, grayscale, or bilevel TIFF image to a YCbCr TIFF image; its mainly provided for testing
• gif2tiff(1) - A quick hack that converts GIF 87a format images to TIFF
• ppm2tiff(1) - A quick hack that converts PPM format images to TIFF
• fax2tiff(1) - Convert raw Group 3 or Group 4 facsimile data to TIFF
• pal2rgb(1) - Convert a Palette-style image to a full color RGB image by applying the colormap
• tiffdither(1) - Dither a b&w image into a bilevel image (suitable for use in creating fax files)
• tiffsplit(1) - Create one or more single-image files from a (possibly) multi-image file
• fax2ps(1) - Convert a Group 3- or Group 4- compressed TIFF to PostScript that is significantly more compressed than is generated by tiff2ps (unless tiff2ps writes PS Level II)
• thumbnail(1) - Copy a bilevel TIFF to one that includes 8-bit greyscale "thumbnail images" for each page; it is provided as an example of how one might use the SubIFD tag (and the library support for it)
• tiffmedian(1) - A version of Paul Heckberts median cut program that reads an RGB TIFF image, and creates a TIFF palette file as a result; its useful for converting full-color RGB images to 8-bit color for your friends that have cheapo 8-bit framebuffers.
• sgi2tiff(1) - A program to convert SGI image files to TIFF. This program is only useful on SGI machines as it uses -limage.

Biblioteksfunktioner

• libtiff(3t) - introduktion

• TIFFCheckTile(3t) - very x,y,z,sample is within image
• TIFFClientOpen(3t) - open a file for reading or writing
• TIFFClose(3t) - close an open file
• TIFFComputeStrip(3t) - return strip containing y,sample
• TIFFComputeTile(3t) - return tile containing x,y,z,sample
• TIFFCurrentDirectory(3t) - return index of current directory
• TIFFCurrentRow(3t) - return index of current scanline
• TIFFCurrentStrip(3t) - return index of current strip
• TIFFCurrentTile(3t) - return index of current tile
• TIFFError(3t) - library error handler
• TIFFFdOpen(3t) - open a file for reading or writing
• TIFFFileName(3t) - return name of open file
• TIFFFileno(3t) - return open file descriptor
• TIFFFlush(3t) - flush all pending writes
• TIFFFlushData(3t) - flush pending data writes
• TIFFGetBitRevTable(3t) - return bit reversal table
• TIFFGetField(3t) - return tag value in current directory
• TIFFGetFieldDefaulted(3t) - return tag value in current directory
• TIFFGetMode(3t) - return open file mode
• TIFFGetVersion(3t) - return library version string
• TIFFIsTiled(3t) - return true if image data is tiled
• TIFFIsByteSwapped(3t) - return true if image data is byte-swapped
• TIFFNumberOfStrips(3t) - return number of strips in an image
• TIFFNumberOfTiles(3t) - return number of tiles in an image
• TIFFReadBufferSetup(3t) - specify i/o buffer for reading
• TIFFReadDirectory(3t) - read the next directory
• TIFFReadEncodedStrip(3t) - read and decode a strip of data
• TIFFReadEncodedTile(3t) - read and decode a tile of data
• TIFFReadRawStrip(3t) - read a raw strip of data
• TIFFReadRawTile(3t) - read a raw tile of data
• TIFFReadRGBAImage(3t) - read an image into a fixed format raster
• TIFFReadScanline(3t) - read and decode a row of data
• TIFFReadTile(3t) - read and decode a tile of data
• TIFFReverseBits(3t) - reverse bits in an array of bytes
• TIFFRGBAImageBegin(3t) - setup decoder state for TIFFRGBAImageGet
• TIFFRGBAImageEnd(3t) - release TIFFRGBAImage decoder state
• TIFFRGBAImageGet(3t) - read and decode an image
• TIFFRGBAImageOK(3t) - is image readable by TIFFRGBAImageGet
• TIFFScanlineSize(3t) - return size of a scanline
• TIFFSetDirectory(3t) - set the current directory
• TIFFSetSubDirectory(3t) - set the current directory
• TIFFSetErrorHandler(3t) - set error handler function
• TIFFSetField(3t) - set a tags value in the current directory
• TIFFSetWarningHandler(3t) - set warning handler function
• TIFFStripSize(3t) - return size of a strip
• TIFFSwabShort(3t) - swap bytes of short
• TIFFSwabLong(3t) - swap bytes of long
• TIFFSwabArrayOfShort(3t) - swap bytes of an array of shorts
• TIFFSwabArrayOfLong(3t) - swap bytes of an array of longs
• TIFFTileRowSize(3t) - return size of a row in a tile
• TIFFTileSize(3t) - return size of a tile
• TIFFVGetField(3t) - return tag value in current directory
• TIFFVGetFieldDefaulted(3t) - return tag value in current directory
• TIFFVSetField(3t) - set a tags value in the current directory
• TIFFWarning(3t) - library warning handler
• TIFFWriteDirectory(3t) - write the current directory
• TIFFWriteEncodedStrip(3t) - compress and write a strip of data
• TIFFWriteEncodedTile(3t) - compress and write a tile of data
• TIFFWriteRawStrip(3t) - write a raw strip of data
• TIFFWriteRawTile(3t) - write a raw tile of data
• TIFFWriteScanline(3t) - write a scanline of data
• TIFFWriteTile(3t) - compress and write a tile of data

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Artikeln skriven 2009-01-17 av Learning4sharing

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