tiffdither(1) [redhat man page]
TIFFDITHER(1) General Commands Manual TIFFDITHER(1) NAME
tiffdither - convert a greyscale image to bilevel using dithering SYNOPSIS
tiffdither [ options ] input.tif output.tif DESCRIPTION
tiffdither converts a single channel 8-bit greyscale image to a bilevel image using Floyd-Steinberg error propagation with threholding. OPTIONS
-c Specify the compression to use for data written to the output file: none for no compression, packbits for PackBits compression, lzw for Lempel-Ziv & Welch compression, zip for Deflate compression, g3 for CCITT Group 3 (T.4) compression, and g4 for CCITT Group 4 (T.6) compression. By default tiffdither will compress data according to the value of the Compression tag found in the source file. The CCITT Group 3 and Group 4 compression algorithms can only be used with bilevel data. Group 3 compression can be specified together with several T.4-specific options: 1d for 1-dimensional encoding, 2d for 2-dimensional encoding, and fill to force each encoded scanline to be zero-filled so that the terminating EOL code lies on a byte boundary. Group 3-specific options are specified by appending a ``:''-separated list to the ``g3'' option; e.g. -c g3:2d:fill to get 2D-encoded data with byte-aligned EOL codes. LZW compression can be specified together with a predictor value. A predictor value of 2 causes each scanline of the output image to undergo horizontal differencing before it is encoded; a value of 1 forces each scanline to be encoded without differencing. LZW- specific options are specified by appending a ``:''-separated list to the ``lzw'' option; e.g. -c lzw:2 for LZW compression with horizontal differencing. -f Specify the bit fill order to use in writing output data. By default, tiffdither will create a new file with the same fill order as the original. Specifying -f lsb2msb will force data to be written with the FillOrder tag set to LSB2MSB , while -f msb2lsb will force data to be written with the FillOrder tag set to MSB2LSB . -t Set the threshold value for dithering. By default the threshold value is 128. NOTES
The dither algorithm is taken from the tiffmedian(1) program (written by Paul Heckbert). SEE ALSO
pal2rgb(1), fax2tiff(1), tiffinfo(1), tiffcp(1), tiff2bw(1), libtiff(3) October 15, 1995 TIFFDITHER(1)
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tiffdither(1) User Commands tiffdither(1) NAME
tiffdither - convert a grayscale image to bilevel using dithering SYNOPSIS
tiffdither [options] input.tif output.tif DESCRIPTION
tiffdither converts a single-channel 8-bit grayscale image to a bilevel image using Floyd-Steinberg error propagation with thresholding. OPTIONS
The following options are supported: -c Specify a compression scheme to use when writing image data: -c g3 CCITT Group 3 compression algorithm. -c g4 CCITT Group 4 compression algorithm. -c lzw Lempel-Ziv and Welch algorithm. -c none No compression. -c packbits PackBits compression algorithm. -c zip Deflate compression algorithm. By default, tiffdither compresses data according to the value of the Compression tag found in the source file. -f Specify the bit fill order to use to write output data. By default, tiffdither creates a new file with the same fill order as the original. Specify -f lsb2msb to force data to be written with the FillOrder tag set to LSB2MSB. Specify -f msb2lsb to force data to be written with the FillOrder tag set to MSB2LSB. -t Set the threshold value for dithering. By default, the threshold value is 128. OPERANDS
The following operands are supported: input.tif The name of the input file. output.tif The name of the output file. EXTENDED DESCRIPTION
The CCITT Group 3 and Group 4 compression algorithms can only be used with bilevel data. Group 3 compression can be specified together with several T.4-specific options: 1d 1-dimensional encoding 2d 2-dimensional encoding fill Force each encoded scanline to be zero-filled so that the terminating EOL code lies on a byte boundary. Group 3-specific options are specified by appending a colon-separated list to the g3 option. For example, specify -c g3:2d:fill to get 2D- encoded data with byte-aligned EOL codes. LZW compression can be specified together with a predictor value. A predictor value of 2 causes each scanline of the output image to undergo horizontal differencing before being encoded. A predictor value of 1 forces each scanline to be encoded without differencing. LZW-specific options are specified by appending a colon-separated list to the lzw option. For example, specify -c lzw:2 for LZW compression with horizontal differencing. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWTiff | +-----------------------------+-----------------------------+ |Interface stability |External | +-----------------------------+-----------------------------+ SEE ALSO
pal2rgb(1), fax2tiff(1), tiffinfo(1), tiffcp(1), tiff2bw(1), libtiff(3) NOTES
Updated by Breda McColgan, Sun Microsystems Inc., 2004. SunOS 5.10 26 Mar 2004 tiffdither(1)