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To: cygwin AT cygwin DOT com
From: zzapper <david AT tvis DOT co DOT uk>
Subject:  Re: Resizing images from CLI
Date: Fri, 28 Apr 2006 12:49:35 +0000 (UTC)
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Reid Thompson <reid DOT thompson AT ateb DOT com> wrote in news:445206FF.80109
@ateb.com:

> zzapper wrote:
>> From the talk NG I got this info for CLI image manipulation
>>
>> requires ImageMagick installed and in path
>>
>> # from imageMagick
>>
>> convert -sample 80x40 abbeyparkarch.gif s_abbeyparkarch.gif
>> lsimg abbeyparkarch.gif s_abbeyparkarch.gif
>>
>> What I'd like now is to resize an image but preserve it's aspect ratio
>>
>> how do?
>>
>>   
> see the imageMagick homepage
> read the convert man page
> 
http://www.imagemagick.org/script/convert.php

In fact 
convert -sample 80x40 abbeyparkarch.gif s_abbeyparkarch.gif
automatically respects ratio, so only the y dimension is guaranteed

convert -resize 80  abbeyparkarch.gif s_abbeyparkarch.gif
respects ratio width 80

convert -resize x40  abbeyparkarch.gif s_abbeyparkarch.gif
respects ratio height 40



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