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Date: Tue, 9 Mar 2010 08:50:21 +1000
From: Wes Barris <wesb AT wesbarris DOT com>
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Subject: Re: 1.7.1-1: ImageMagick seems to lack jpeg support
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Merek Thorondursson wrote:
> The IM convert command handles jpeg images well.

Converting jpeg images with IM on cygwin works for me too.
I too have never seen that notation (although it may work).
I would use either '-resize 600' or '-resize 600x600' both of
which would preserve the aspect ratio.

Maybe there is something wrong with that particular jpeg.  Have
you tried this on others?

If you type 'identify -list format | fgrep JPEG' is jpeg listed with rw-?

> I'm a novice with ImageMagick, but I don't normally see -geometry
> used this way.  I could be wrong with what you're trying to do, but
> if you're simply trying to resize a test jpeg with the 600x notation
> I'd guess you're resizing with intent to maintain the aspect ratio
> and a final width of 600 pixels.  The command line notation I'd use
> to do that would be:
> 
>> convert test.jpg -resize 600x test-out.jpg
> 
>    --- Merek
> 
> Hope this helps.  Sorry if I misunderstood the problem.
> 
> On 3/8/10, Nick White <cygwin-list AT njw DOT me DOT uk> wrote:
> · The command convert, from the ImageMagick suite, doesn't appear to
> · have a properly configured jpeg decoder.
> 
> · # convert test.jpg -geometry 600x test-out.jpg
> · convert: no decode delegate for this image format `test.jpg'.
> · convert: missing an image filename `test-out.jpg'.
> ·
> · Which would imply that jpegs should be readable and writable by
> · convert, which they don't appear to be.
> 
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-- 
Wes Barris
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