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Full Discussion: bash - batch processing folder of files by name
Top Forums Shell Programming and Scripting bash - batch processing folder of files by name Post 302333474 by imtombi on Monday 13th of July 2009 07:14:12 AM
Old 07-13-2009
bash - batch processing folder of files by name
Hello Everyone!!!

I need some help with a shellscript to batch process a folder of files with the imagemagick convert -append/+append command. The folder contains some hundred or thousand of small images in .png format which I would like to join together in order of their filenames. The filenames follow a pattern like this:

File 1: 11.123456_8.043589.png
File 2: 11.123456_9.320411.png
File 3: 12.843211_8.043589.png
File 4: 12.843211_9.320411.png

What I want to do is join all files with the same number in the first part of the filename (before the underscore) with the convert +append command to a row and afterwards join these rows together with the convert -append comand. This could also be a second script, if easier.
I figured out the imagemagick part of this, but as an absolute beginner to shellscripting, I have no clue how to get a appropriate shellscript up and running. I have searched the forum but didn't find anything that worked out for me or pointed me in the right direction. I would really appreciate some help here!

Greetings,

Gerd
 

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LEARN ABOUT DEBIAN

pngnq

PNGNQ(1)							   User Manuals 							  PNGNQ(1)

NAME

       pngnq - quantize png images

SYNOPSIS

       pngnq [-vfhV][-s sample_factor ][-Q dither ][-g gamma ][-e extension ][-d dir ][-n colors ][ inputfiles ]

DESCRIPTION

       pngnq  quantizes  a 32-bit RGBA PNG image to an 8 bit RGBA palette PNG using the neuquant algorithm. The output file name is the input file
       name extended with "-nq8.png" or a specified extension.

OPTIONS

       -v     Verbose mode. Prints status messages.

       -f     Force overwriting of files.

       -s sample factor
	      Sample factor. The neuquant algorithm samples pixels stepping by this value.  The default value of 3 gives good results. Higher val-
	      ues sample less of the image pixels and thus are faster but less accurate. A factor of 1 samples every image pixel.

       -n colors
	      Specifies the number of colors to quantize to. Defaults to 256 which is the maximum.  The minimum here is 2.

       -Q dither
	      Choose a dithering method: n = no dither (default), f = Floyd Steinberg dithering.

       -g gamma
	      Set the image gamma correction. If not present, uses the png file's gamma or defaults to 1.0.

       -e extension
	      Specifies the new filename extension. Defaults to "-nq8.png".  Pngnq drops .png from the original filenames. If you set the argument
	      of the -e option to .png and choose the -f option the input file will be overwritten.

       -d dir Tells pngnq to put output files in a directory other than the one the input files are in.

       input files
	      The png files to be processed. Defaults to standard input if not specified.  If standard input is being processed the output is sent
	      to standard output.

       -h     Print program help.

       -V     Print version number and library versions.

BUGS

       Does not deal correctly with greyscale alpha images with low bit depths, but these wont benefit from quantizing.

AUTHOR

       Stuart Coyle <stuart.coyle@gmail.com>

SEE ALSO

       png(5)

Linux								     MAY 2009								  PNGNQ(1)
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