Man Pages

tiffmedian(1) - phpMan tiffmedian(1) - phpMan

Command: man perldoc info search(apropos)  


TIFFMEDIAN(1)                                                    TIFFMEDIAN(1)



NAME
       tiffmedian - apply the median cut algorithm to data in a TIFF file

SYNOPSIS
       tiffmedian [ options ] input.tif output.tif

DESCRIPTION
       tiffmedian  applies  the  median cut algorithm to an RGB image in input.tif to generate a palette image that is
       written to output.tif.  The generated colormap has, by default, 256 entries.  The image data  is  quantized  by
       mapping each pixel to the closest color values in the colormap.

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, and zip for Deflate  compression.   By
              default  tiffmedian will compress data according to the value of the Compression tag found in the source
              file.

              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  append-
              ing  a  '':''-separated  list  to the ''lzw'' option; e.g.  -c lzw:2 for LZW compression with horizontal
              differencing.

       -C     Specify the number of entries to use in the generated colormap.  By default all 256  entries/colors  are
              used.

       -f     Apply Floyd-Steinberg dithering before selecting a colormap entry.

       -r     Specify  the  number  of rows (scanlines) in each strip of data written to the output file.  By default,
              tiffmedian attempts to set the rows/strip that no more than 8 kilobytes of data appear in a strip.

NOTES
       This program is derived from Paul Heckbert's median program.

SEE ALSO
       pal2rgb(1), tiffinfo(1), tiffcp(1), tiffcmp(1), libtiff(3TIFF)

       Color Image Quantization for Frame Buffer Display, Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.

       Libtiff library home page: http://www.remotesensing.org/libtiff/



libtiff                        November 2, 2005                  TIFFMEDIAN(1)