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Performance problem with removing duplicates in a huge file (50+ GB)
Post 302752669 by Corona688 on Monday 7th of January 2013 11:16:00 AM
01-07-2013
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LEARN ABOUT SUNOS
rgb2ycbcr
rgb2ycbcr(1) User Commands rgb2ycbcr(1) NAME
rgb2ycbcr - convert non-YCbCr TIFF images to YCbCr TIFF images SYNOPSIS
rgb2ycbcr [options] src1.tif [src2.tif...] dest.tif DESCRIPTION
rgb2ycbcr converts RGB color, grayscale, 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, and output data files are compressed with the LZW compression scheme, with each strip no more than 8 kilobytes. These characteristics can be overridden or explicitly specified with the options described below. OPTIONS
The following options are supported: -c Specify a compression scheme to use when writing image data: -c jpeg Baseline JPEG compression algorithm. -c lzw Lempel-Ziv and Welch algorithm. This is the default algorithm. -c none No compression. -c packbits PackBits compression algorithm. -h Set the horizontal sampling dimension to one of the following: 1, 2, or 4. The default value is 2. -r Write data with a specified number of rows per strip. By default, the number of rows per strip is selected so that each strip is approximately 8 kilobytes. -v Set the vertical sampling dimension to one of the following: 1, 2, or 4. The default value is 2. OPERANDS
The following operands are supported: src.tif The name of the input file that contains non-YCbCr TIFF data. dest.tif The name of the output file that contains YCbCr TIFF data. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWTiff | +-----------------------------+-----------------------------+ |Interface stability |External | +-----------------------------+-----------------------------+ SEE ALSO
tiffinfo(1), tiffcp(1), libtiff(3) NOTES
Updated by Breda McColgan, Sun Microsystems Inc., 2004. SunOS 5.10 26 Mar 2004 rgb2ycbcr(1)