19 lines
360 B
Bash
19 lines
360 B
Bash
#!/bin/sh
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# shrink to a target width
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# default prefix
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VIPSHOME=${VIPSHOME-@prefix@}
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name=$0
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bname=`basename $0`
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if [ $# != 3 ]; then
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echo "${bname}: usage: $bname <in> <out> <target width>"
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exit 1
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fi
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inwidth=`$VIPSHOME/bin/vips im_header_int Xsize $1`
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factor=`(echo scale=10; echo $inwidth / $3) | bc`
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$VIPSHOME/bin/vips im_shrink $1 $2 $factor $factor
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