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.TH "RGB2YCBCR" "1" "Jun 10, 2023" "4.5" "LibTIFF"
.SH NAME
rgb2ycbcr \- convert non-YCbCr TIFF images to a YCbCr TIFF image
.SH SYNOPSIS
.sp
\fBrgb2ycbcr\fP [ \fIoptions\fP ] \fIsrc1.tif src2.tif … dst.tif\fP
.SH DESCRIPTION
.sp
\fBrgb2ycbcr\fP 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.
.sp
By default, chrominance samples are created by sampling
2 by 2 blocks of luminance values; this can be changed with the
\fI\%\-h\fP and \fI\%\-v\fP options.
Output data are compressed with the \fBPackBits\fP
compression scheme, by default; an alternate scheme can be selected with the
\fI\%\-c\fP 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 \fI\%\-r\fP
option can be used to explicitly set the number of
rows per strip.
.SH OPTIONS
.INDENT 0.0
.TP
.B \-c compress
Specify a compression scheme to use when writing image data:
\fB\-c none\fP for no compression,
\fB\-c packbits\fP for the PackBits compression algorithm (the default),
\fB\-c jpeg\fP for the JPEG compression algorithm,
\fB\-c zip\fP for the deflate compression algorithm, and
\fB\-c lzw\fP for Lempel\-Ziv & Welch.
.UNINDENT
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.TP
.B \-h size
Set the horizontal sampling dimension to one of: 1, 2 (default), or 4.
.UNINDENT
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.TP
.B \-r striprows
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.
.UNINDENT
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.TP
.B \-v size
Set the vertical sampling dimension to one of: 1, 2 (default), or 4.
.UNINDENT
.SH SEE ALSO
.sp
\fI\%tiffinfo\fP (1),
\fI\%tiffcp\fP (1),
\fI\%libtiff\fP (3tiff)
.SH AUTHOR
LibTIFF contributors
.SH COPYRIGHT
1988-2022, LibTIFF contributors
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