Uninstall produces a Fatal error: Call to undefined function image_resize_filter_delete_all()

Confirmed. I also tried with the 7.x-1.x-dev dated Feb 25th and it produced the same error.

Not sure if this is the same issue: When I attempt to confirm the uninstall of 'image resize filter' I am taken to a blank page. Reloading the uninstall module page still lists 'image resize filter'

quite possible. I'd suggest getting an error to print to the screen so that you can make sure.

Not only does this module not uninstall, but it's functionality stays active even after module has been turned off.

Drupal does not load the module file, when uninstall is called. As the uninstall calls a function in the module, this needs to be done manual (see http://api.drupal.org/api/drupal/modules--system--system.api.php/functio... )

Solution: add drupal_load method to load the module file in the image_resize_filter.install file line 15.

function image_resize_filter_uninstall() {
  drupal_load('module', 'image_resize_filter');
  image_resize_filter_delete_all();
}

Thanks! Adding that line did allow me to uninstall the module successfully.

Here's a patch which adds that line. Somebody please review so the maintainer can commit it.

Looks good to me, committed to both branches.