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RGB2YCBCR
RGB2YCBCR
NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO
NAME
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rgb2ycbcr − convert non-YCbCr TIFF
images to a YCbCr TIFF image
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SYNOPSIS
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rgb2ycbcr [ options ] src1.tif src2.tif
... dst.tif
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DESCRIPTION
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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.
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OPTIONS
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−c
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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.
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−h
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Set the horizontal sampling dimension to one of: 1, 2
(default), or 4.
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−r
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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.
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−v
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Set the vertical sampling dimension to one of: 1, 2
(default), or 4.
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SEE ALSO
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tiffinfo(1), tiffcp(1),
libtiff(3)
Libtiff library home page:
http://www.remotesensing.org/libtiff
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