How to change the size of preview image

[purepense]

Hello im trying to change the size of the preview image, but I'm not sure where is that information,
Any help will be appreciating.
Thanks

[Αndré]

It's a config setting: http://documentation.coppermine-gallery.net/en/configuration.htm#admin_picture_thumbnail_max-dimension

[purepense]

Thanks Andre, the Link you provide me has all the information I was looking for.