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Jul 19, 2008 ( Saturday )

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bash to automate generating thumbnails

Generating a thumbnail from the original image is not hard, just read the command-line options for Linux convert command (frontend for ImageMagick). While batch handling over 1M images files at one shot need some scripts. This is where bash kicks in and make your life easier. Below is a short bash script I wrote last night which worked perfectly for my work:

#!/bin/bash
# Usage : ./mkthumb.sh

imagedir=/data/pictures
thumbdir=/data/thumbnails

find "$imagedir" -type f -print | while IFS='\n' read -r image; do
    thumb=${image/$imagedir/$thumbdir}
    thumbfiledir=${thumb%/*}
    if ! [ -d "$thumbfiledir" ]; then
        mkdir -p "$thumbfiledir"
    fi
    echo " |-- $(( i++ )) converting '$image' to '$thumb'"
    convert "$image" -thumbnail 120 "$thumb"
done

and then run it as follows:

bash~ ./mkthumb.sh >20080718.thumbnail.log 2>20080718.thumbnail.err &
bash~ tail -f 20080718.thumbnail.log

Add tags: automation bash

by xicheng

10:41:53 |

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Username:	xicheng
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	Generating a thumbnail from the original image is not hard, just read <ca href="http://www.imagemagick.org/script/command-line-options.php">the command-line options</ca> for Linux <cb>convert</cb> command (frontend for ImageMagick). While batch handling over 1M images files at one shot need some scripts. This is where bash kicks in and make your life easier. Below is a short bash script I wrote last night which worked perfectly for my work:<c_readmore/> <cdiv_w400 bcyan> #!/bin/bash # Usage : ./mkthumb.sh imagedir=/data/pictures thumbdir=/data/thumbnails find "$imagedir" -type f -print \| while IFS='\n' read -r image; do thumb=${image/$imagedir/$thumbdir} thumbfiledir=${thumb%/*} if ! [ -d "$thumbfiledir" ]; then mkdir -p "$thumbfiledir" fi echo " \|-- $(( i++ )) converting '$image' to '$thumb'" convert "$image" -thumbnail 120 "$thumb" done </cdiv> and then run it as follows: <cdiv_bcyan> bash~ ./mkthumb.sh >20080718.thumbnail.log 2>20080718.thumbnail.err & bash~ tail -f 20080718.thumbnail.log </cdiv>