After searching the web and drupal forums for a solution to no avail, we finally decided to create a small hack of the image module. This will allow users browsing images to click on the "view original" link and have the image open in a new, customized window. There are a couple ways to do this.

Method 1: Fullscreen popup

Step A: Edit page.tpl.php (in your theme directory) and put the following between the HEAD tags:

Step B: Edit the image.module (in your modules directory) and replace

 $links[] = l(t('view original'), 'node/'.$node->nid, NULL, 'size=_original');

with (on one line)

 $links[] = '<a onclick="fullScreen(\'image/view/' . $node-&gt;nid . '?' 
. 'size=_original'\');" href="javascript:void(0);">' . t('view original') . '</a>'; 

Method 2: Centred popup

Step A: Edit page.tpl.php (in your theme directory) and put the following between the HEAD tags:

Step B: Edit the image.module (in your modules directory) and replace

 $links[] = l(t('view original'), 'node/'.$node->nid, NULL, 'size=_original');

with (on one line)

 $links[] = '<a onclick="NewWindow(this.href,\'name\',\'1000\',\'1000\',\'yes\');
return false;" href="image/view/' . $node-&gt;nid . '?' . 'size=_original">' . t('view original') . '</a>'; 

You can replace the '1000's with the desired width and height. You can replace the 'name' to specify the window label. If you do not want scrollbars on the popup window, change the 'yes' to 'no'