Views page showing a user's content I have created a image gallery on Drupal 7 users' profiles, which I would like to present as a separate page, linked to their profiles using views.

so, there would be a page at mysite.com/typical-user/gallery

I am at a loss on how to use the contextual filters to achieve this.
If you want to filter gallery images by user id try "provide default value" and than use arg(1) which is user id in your URL, More on this here : http://api.drupal.org/api/drupal/includes%21bootstrap.inc/function/arg/7