Re: Magick-users Digest, Vol 83, Issue 11

Thanks, '-strip' solved the problem:
mogrify -strip -quality 25% -type optimize -format jpg ...image.psd

Regards
David McMillan
SelectSpecs.com 


On 17/12/2009 20:00, "[email protected]"
<[email protected]> wrote:

> Message: 1
> Date: Wed, 16 Dec 2009 14:10:41 -0800
> From: Roger Howard <[email protected]>
> Subject: Re: [magick-users] Reducing file sizes with mogrify
> To: SelectSpecs <[email protected]>
> Cc: [email protected]
> Message-ID: <d0e2f55ca42bd055d63141544dc3b30c@localhost>
> Content-Type: text/plain; charset="UTF-8"
> 
> 
> On Wed, 16 Dec 2009 11:21:27 +0000, SelectSpecs <[email protected]> wrote:
>> Using a Mac 2.66 Quad running OS10.6.2, I'm creating files with mogrify:
>> mogrify -quality 25% -type optimize -format jpg ...image.psd
>> 
>> But the file sizes will not go below 33kb, irrespective of how low I make
>> the quality. Using Photoshop I can produce the equivalent quality image
> at
>> under 2kb.
>> 
>> Any advice on how to reduce the file size would be appreciated?
> 
> It's entirely possible your images have very large metadata packets in them
> - try adding -strip to your command, or check your output images with
> exiftool to see what kind of metadata payload they contain - it's very
> possible for small images to have a majority of their byte budget spent on
> unnecessary metadata. Also, are you possibly using a large custom ICC
> profile in your source files?
> 
> Personally, i'd use a more fine-toothed approach to stripping metadata -
> for instance, even in thumbs I'd preserve IPTC-IIM versions of the rights
> information, which won't add much to your file sizes, but strip all XMP.
> For larger files, I'd preserve XMP as well, but selectively remove some
> fields.
> 
> -R