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<title>RGB2YCBCR</title>

RGB2YCBCR

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

SEE ALSO

NAME

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rgb2ycbcr − convert non-YCbCr <small>TIFF</small>

images to a YCbCr <small>TIFF</small> image

SYNOPSIS

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rgb2ycbcr [ options ] src1.tif src2.tif

... dst.tif

DESCRIPTION

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rgb2ycbcr converts <small>RGB</small> color,

greyscale, or bi-level <small>TIFF</small> 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 <small>PackBits</small> 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

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−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

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tiffinfo(1), tiffcp(1),

libtiff(3)

Libtiff library home page:

http://www.remotesensing.org/libtiff