rgb2ycbcr
convert non-YCbCr TIFF images to a YCbCr TIFF image
see also :
tiffinfo - tiffcp
Synopsis
rgb2ycbcr
[ options ] src1.tif src2.tif ... dst.tif
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description
rgb2ycbcr
converts RGB color, greyscale, or bi-level
TIFF 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; this can be changed with the
-h and -v options. Output data are
compressed with the PackBits compression
scheme, by default; an alternate scheme can be selected with
the -c option. By default, output data are
compressed in strips with the number of rows in each strip
selected so that the size of a strip is never more than 8
kilobytes; the -r option can be used to
explicitly set the number of rows per strip.
options
-c
Specify a compression scheme to
use when writing image data: -c none for no
compression, -c packbits for the PackBits
compression algorithm (the default), -c jpeg
for the JPEG compression algorithm, -c zip for
the deflate compression algorithm, and -c lzw
for Lempel-Ziv & Welch.
-h
Set the horizontal sampling dimension to one of: 1, 2
(default), or 4.
-r
Write data with a specified number of rows per strip; by
default the number of rows/strip is selected so that each
strip is approximately 8 kilobytes.
-v
Set the vertical sampling dimension to one of: 1, 2
(default), or 4.
see also
tiffinfo ,
tiffcp , libtiff
Libtiff library
home page: http://www.remotesensing.org/libtiff