Hi Arne,
I actually don't think this can be done. It is an action in which an existing file on Commons must be updated, this is not supported by the toolset. We had a similar issue with higher res. Video files. We decided to stick with the current resolution. Alternatively, a volunteer could do this update using a script.
Best,
Jesse

verzonden vanaf mijn smartphone|sent from my smart phone

Op 17 dec. 2015 11:03 schreef "Hans Muller" <j.m.muller@hccnet.nl>:
Dear Arne,

Yes, this is a modest batch that can be done with the GW toolset, most
easily if the images each have a (temporary) individual URL and so are
accessible on the internet.

Groeten, hans muller

Op Do, 17 december, 2015 10:57 am schreef Arne Wossink:
> Hi all,
>
>
> Museum Catharijneconvent has approached us that they would like to make
> higher-resolution versions available of images that are already available
> on Commons. Around 800-1500 images are involved.
>
> Is this something that can be handled by the GW toolset, or are there
> better ways to do this?
>
> Best,
>
>
> Arne Wossink
>
>
> Projectleider / Project Lead Wikimedia Nederland
>
>
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