RGB2YCBCR

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)