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OpenSolaris 2009.06 - man page for tiffdither (opensolaris section 1)

tiffdither(1)							   User Commands						     tiffdither(1)

tiffdither - convert a grayscale image to bilevel using dithering
tiffdither [options] input.tif output.tif
tiffdither converts a single-channel 8-bit grayscale image to a bilevel image using Floyd-Steinberg error propagation with thresholding.
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.
The following operands are supported: input.tif The name of the input file. output.tif The name of the output 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 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.
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWTiff | +-----------------------------+-----------------------------+ |Interface stability |Uncommitted | +-----------------------------+-----------------------------+
pal2rgb(1), fax2tiff(1), tiffinfo(1), tiffcp(1), tiff2bw(1), libtiff(3)
Updated by Breda McColgan, Sun Microsystems Inc., 2004. SunOS 5.11 26 Mar 2004 tiffdither(1)