RGB2YCBCR

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO

NAME

rgb2ycbcr − convert non-YCbCr TIFF images to a YCbCr TIFF image

SYNOPSIS

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

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 LZW 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, -c jpeg for the JPEG compression algorithm, and −c lzw for Lempel-Ziv & Welch (the default).

−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(1), tiffcp(1), libtiff(3)