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Full Discussion: Speed up bash loop?
Top Forums Shell Programming and Scripting Speed up bash loop? Post 302960679 by RudiC on Wednesday 18th of November 2015 12:42:20 PM
Old 11-18-2015
Instead of reading 750 MB, you are reading 3GB to operate on. With the four input files in arrays and an extended algorithm, the performance might be way faster.
If we had some meaningful samples, we could work out a small test script...
 

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SGI2TIFF(1)						      General Commands Manual						       SGI2TIFF(1)

NAME
sgi2tiff - create a TIFF file from an SGI image file SYNOPSIS
sgi2tiff [ options ] input.rgb output.tif DESCRIPTION
sgi2tiff converts a file in the SGI image format to TIFF. By default, the TIFF image is created with data samples packed (PlanarConfigura- tion=1), compressed with the Lempel-Ziv & Welch algorithm (Compression=5), and with each strip no more than 8 kilobytes. These character- istics can overridden, or explicitly specified with the options described below. OPTIONS
-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 baseline JPEG compression algorithm, -c zip for the Deflate compression algorithm, and -c lzw for Lem- pel-Ziv & Welch (the default). -p Explicitly select the planar configuration used in organizing data samples in the output image: -p contig for samples packed con- tiguously, and -p separate for samples stored separately. By default samples are packed. -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 approxi- mately 8 kilobytes. BUGS
Does not record colormap information. SEE ALSO
tiffinfo(1), tiffcp(1), tiffmedian(1), libtiff(3) Libtiff library home page: http://www.remotesensing.org/libtiff/ libtiff November 2, 2005 SGI2TIFF(1)
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