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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  Com-
		       pression 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  Fil-
		       lOrder tag set to MSB2LSB.

       -t	       Set  the threshold value for dithering. By default, the threshold value is

       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  termi-
			       nating 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

       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)

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