Table of Contents
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 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.
- -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.
tiffinfo(1)
, tiffcp(1)
, libtiff(3)
Table of Contents