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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 + |
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+
+ 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 + |
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+ Set the horizontal sampling dimension to one of: 1, 2 +(default), or 4. + |
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+
+ −r + |
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+ 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 + |
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+
+ Set the vertical sampling dimension to one of: 1, 2 +(default), or 4. + |
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+ tiffinfo(1), tiffcp(1), +libtiff(3) + +Libtiff library home page: +http://www.remotesensing.org/libtiff + |
+