User Commands                                        rgb2ycbcr(1)



NAME
     rgb2ycbcr - convert non-YCbCr  TIF  images  to  YCbCr  TIF
     images

SYNOPSIS
     rgb2ycbcr [options] src1.tif [src2.tif...] dest.tif

DESCRIPTION
     rgb2ycbcr converts RGB color, grayscale,  or  bi-level  TIF
     images  to  YCbCr  images by transforming and sampling pixel
     data. If multiple files are specified on the  command  line,
     each source file is converted to a separate directory in the
     destination file.

     By default, chrominance samples are created by sampling 2 by
     2  blocks  of  luminance  values,  and output data files are
     compressed with the LZW compression scheme, with each  strip
     no more than 8 kilobytes. These characteristics can be over-
     ridden or explicitly specified with  the  options  described
     below.

OPTIONS
     The following options are supported:

     -c              Specify a compression  scheme  to  use  when
                     writing image data:


                     -c jpeg                 Baseline        JPEG
                                             compression    algo-
                                             rithm.




                     -c lzw                  Lempel-Ziv and Welch
                                             algorithm.  This  is
                                             the  default   algo-
                                             rithm.



                     -c none                 No compression.



                     -c packbits             PackBits compression
                                             algorithm.







SunOS 5.11          Last change: 26 Mar 2004                    1






User Commands                                        rgb2ycbcr(1)



     -h              Set the horizontal sampling dimension to one
                     of  the  following:  1, 2, or 4. The default
                     value is 2.



     -r              Write data with a specified number  of  rows
                     per  strip.  By  default, the number of rows
                     per strip is selected so that each strip  is
                     approximately 8 kilobytes.



     -v              Set the vertical sampling dimension  to  one
                     of  the  following:  1, 2, or 4. The default
                     value is 2.



OPERANDS
     The following operands are supported:

     src.tif         The name of the  input  file  that  contains
                     non-YCbCr TIF data.



     dest.tif        The name of the output  file  that  contains
                     YCbCr TIF data.



ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Availability                 SUNWTiff                    
    
     Interface stability          Uncommitted                 
    


SEE ALSO
     tiffinfo(1), tiffcp(1), libtiff(3)

NOTES
     Updated by Breda McColgan, Sun Microsystems Inc., 2004.





SunOS 5.11          Last change: 26 Mar 2004                    2