RGB2YCBCR
Section: User Commands (1)
Updated: December 12, 1991
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NAME
rgb2ycbcr - convert non-YCbCr
TIFF
images to a YCbCr
TIFF
image
SYNOPSIS
rgb2ycbcr
[
-c
compression
] [
-h
hsample
] [
-v
vsample
] [
-r
rows/strip
]
src1 src2 ... dst
DESCRIPTION
Rgb2ycbcr
converts
RGB
color, grayscale, or bilevel
TIFF
images to YCbCr images by
transforming and sampling pixel data.
If multiple files are specified on the command line,
rgb2ycbcr
converts all but the last file, writing a
separate directory for each source
in the destination file.
By default, chrominance samples are created by sampling
2 by 2 blocks of luminance values.
The
-h
and
-v
options can be used to specify alternate horizontal
and vertical sampling dimensions, respectively.
Note that only 1, 2, and 4 should be used for portability.
By default, output data are compressed with the
LZW
compression scheme.
A different scheme can be selected with the
-c
option; one of:
none
(for no compression),
packbits
(for PackBits compression),
and
lzw
(for
LZW
compression).
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.
SEE ALSO
tiffinfo(1),
tiffcp(1),
libtiff(3)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- SEE ALSO
-
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