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rgb2ycbcr - convert non-YCbCr TIFF
images
to a YCbCr TIFF
image
rgb2ycbcr [ options ] src1.tif src2.tif
... dst.tif
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.
- -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.
tiffinfo(1)
, tiffcp(1)
, libtiff(3)
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