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tiffdither ()
  • >> tiffdither (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • tiffdither (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • 
    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  pred-
              ictor  value.  A predictor value of 2 causes each scan-
              line of the output image  to  undergo  horizontal  dif-
              ferencing  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 Fil-
              lOrder 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)
    
    
    
    


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