Is there something we can do to make the WP gallery use the media library's large or medium image size instead of the full size image?
I'm building a site and I have some nice high res images to use. But I'd rather not have to process them all before uploading them, especially as WP already produces images at the right size - the large image size would be perfect for me, but it could just as well be other sizes in other situations.
I just don't need the galleries to use the full size image.
In this case I'm using the Gallery Slideshow plugin, but I don't think that is a particular hindrance in this situation.
Is there something we could add to functions.php or something to make the WP gallery use our selected image size?
Note: I am not talking about the size of the gallery thumbnails that you click to see the bigger image; I am talking about the size of the bigger image that is displayed once you've clicked the smaller thumbnail.