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rgb2ycbcr − convert non-YCbCr TIFF images to a YCbCr TIFF image |
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rgb2ycbcr [ options ] src1.tif src2.tif ... dst.tif |
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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. |
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−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. |
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−h |
Set the horizontal sampling dimension to one of: 1, 2 (default), or 4. |
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−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. |
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−v |
Set the vertical sampling dimension to one of: 1, 2 (default), or 4. |
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tiffinfo(1), tiffcp(1), libtiff(3) |