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
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(1),
tiffcp(1),
libtiff(3)
Libtiff library home page:
http://www.remotesensing.org/libtiff