1RGB2YCBCR(1)                General Commands Manual               RGB2YCBCR(1)
2
3
4

NAME

6       rgb2ycbcr - convert non-YCbCr TIFF images to a YCbCr TIFF image
7

SYNOPSIS

9       rgb2ycbcr [ options ] src1.tif src2.tif ... dst.tif
10

DESCRIPTION

12       rgb2ycbcr  converts  RGB  color,  greyscale, or bi-level TIFF images to
13       YCbCr images by transforming and sampling pixel data. If multiple files
14       are  specified  on  the command line each source file is converted to a
15       separate directory in the destination file.
16
17       By default, chrominance samples are created by sampling 2 by  2  blocks
18       of  luminance  values;  this can be changed with the -h and -v options.
19       Output data are compressed with the  PackBits  compression  scheme,  by
20       default;  an  alternate  scheme can be selected with the -c option.  By
21       default, output data are compressed in strips with the number  of  rows
22       in each strip selected so that the size of a strip is never more than 8
23       kilobytes; the -r option can be used to explicitly set  the  number  of
24       rows per strip.
25

OPTIONS

27       -c     Specify  a compression scheme to use when writing image data: -c
28              none for no compression, -c packbits for the  PackBits  compres‐
29              sion  algorithm  (the default), -c jpeg for the JPEG compression
30              algorithm, -c zip for the deflate compression algorithm, and  -c
31              lzw for Lempel-Ziv & Welch.
32
33       -h     Set the horizontal sampling dimension to one of: 1, 2 (default),
34              or 4.
35
36       -r     Write data with a specified number of rows per strip; by default
37              the  number  of  rows/strip  is  selected  so that each strip is
38              approximately 8 kilobytes.
39
40       -v     Set the vertical sampling dimension to one of: 1,  2  (default),
41              or 4.
42

SEE ALSO

44       tiffinfo(1), tiffcp(1), libtiff(3)
45
46       Libtiff library home page: http://www.remotesensing.org/libtiff
47
48
49
50libtiff                        November 2, 2005                   RGB2YCBCR(1)
Impressum