[magick-users] convert -crop image quality question

[J. Young]

Gabe Schaffer wrote:
> On 11/5/06, Anthony Thyssen <anthony at griffith.edu.au> wrote:
>> "J. Young" on  wrote...
>
>> | convert bigpage.jpg -crop 50%x0+0+0 page1.jpg
>> | convert bigpage.jpg -gravity East -crop 50%x0+0+0 page2.jpg
>> |
>> | So this works ok, but is it a lossless operation as far as image
>> | quality?  If not, could someone recommend a lossless equivalent?
>> |
>> JPEG to JPEG is always lossless in IM.
>
> Always lossless? Did you mean never?
>
>> and there does not appear to be a lossless cut or crop opperation
>> provided by jpgtran.    I'd say you best bet is to just not save back to
>> JPEG, or upgrade to using the new JPG2K library.
>
> The version of jpegtran on my machine (from 1998) has a crop feature,
> and I'm pretty sure that jpegtran doesn't even have the capability to
> perform lossy operations.
>
> I'm going to bet that jpegtran -crop is exactly what the OP wants.
>
> GNS
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Is jpegtran -crop depreciated?  I don't seem to have that available...